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LED + Building

Issue 67 Jun / Jul 2012

Thankfully, this year’s Light & Building passed uneventfully with no volcano eruptions to add to the challenge of walking a few kilometres between halls to see thousands of exhibitors amongst the more than 190,000 visitors to the event.

It was clear that Frankfurt 2012 was the year LEDs became the dominant light source and I estimated traditional light sources represented only 5% of the total number of light fixtures installed. Even in hall 10 I saw only two stands that offered CFL lamps – needless to say they were empty!

However, it wasn’t LED technology that impressed – far from it – OLEDs took a far more impressive stage along with a prospective new twist on fibre optic lighting promised by Toshiba. On one level I was hugely disappointed by the LED offering because the majority of stands still used LEDs as traditional light sources within fixtures rather than an exciting new light source that can create a different style of lighting fixtures with new functionality. Of course, the industry is moving slowly towards innovation with several manufacturers demonstrating variable colour temperature fixtures however I witnessed too many stands demonstrating the fact that quality of light and quality of products were definitely low down on the design criteria of their engineers at the start of the fixture design project.

Unfortunately, this wasn’t just my opinion and droves of lighting designers that attended my IALD presentation on the advantages and disadvantages of LED lighting concurred, stating that quality was too low down the priority list of most manufacturers. In fact it was rather depressing listening for over an hour after my presentation finished to the raft of lighting designer horror stories. The really good news is that it appears most experienced lighting designers now understand LED technology short-falls so the probability of major issues on projects moving forward should be less than that seen over the last few years. However it was clear there is a lack of high quality and consistent products dominant in the marketplace today. As usual I received many challenging questions after my presentation but there was one question that stood out – ‘How do I specify variable CCT lighting fixtures within a project?’ This was an excellent question so I am planning to write a future article explaining what variable colour changing products are, how they work, their advantages and disadvantages, how to specify them and most importantly how to control them within projects.

Certain parts of the LED lighting industry showed glimpses of promise during the show by focusing on quality of light, including CCT, CRI and lumen maintenance of light fixtures over long periods of use, and these leaders will show the way for the rest of the fixture manufacturers to follow.

OLEDs maturing fast with innovative breakthrough products   
I have to admit, I have not focused on OLEDs in recent years, mainly due to the fact that everyone I spoke with (including OLED evangelists) stated OLEDs would only become a viable light source after 2020. In my mind by 2020 LEDs would be close to 270lm/W at the emitter level, have L70 lifetimes in the 150,000 hours with CRI > 90 and colour consistency below two standard McAdam ellipses - all at a price of US$1 for 1000 lumens so I had assigned OLEDs to an interesting but irrelevant lighting technology.

Fortunately it seems that OLEDs are following the LED maturity trajectory by becoming useful in 2012 with the launch of several commercially available and stylish OLED products by Winona Lighting, a division of Acuity Brands.

Indeed, Winona launched two new OLED fixtures called the Revel and Kindred that utilised efficient and high performing OLED panels provided by LG Chem, with efficacies of 60 lumens per watt. Both luminaire families provide performance-based lighting solutions designed for indoor ambient and decorative applications.

The contemporary Kindred luminaire shown in figure 1 has been designed with 45 OLED panels to deliver 3382 lumens using 66W to provide a room with individualised canopies of light. Its evocative, iconic shape, especially when mounted in close proximity, promotes a feeling of visual comfort, while its thin profile and gentle curvature create a sense of spacial intimacy. The complete Kindred luminaire series is available in three sizes and multiple mounting options. It delivers decorative, custom or general lighting solutions and can be used in many types of applications, including office, hospitality, retail, residential and specialty public areas.

Winona’s Revel luminaire, inspired by the organic shapes of flowers, is a 7.3W, 370 lumen lighting system that gives designers the freedom to create lighting patterns tailored to their unique application. Its simple, yet elegant and thin, form factor allows designers to augment architectural elements of ceilings and walls while providing high-quality ambient lighting. Now available in several mounting styles, Revel can be applied in a multitude of ways to provide accent or functional lighting that breaks away from rectangular grid layouts.

Impressively, both fixtures achieve 51lm/W total system efficacy from LG panels that reach 60lm/W which makes both luminaires highly usable from an energy efficiency perspective. If one ignores cost at this stage (just don’t ask right now!) and compares the total system performance to LED panels (~70-80lm/W) generating similar light levels ,then both these OLED fixtures are surprisingly very close.

The fixtures offer a CRI >80 with positive R9 values meaning an improved colour rendition. The L70 lifetime of the fixtures are quoted at 15,000 hours rated at 25ºC and luminous uniformity is >85%.
OSRAM also demonstrated their latest OLED offering, the Orbeos SDW-058 with a light emitting surface area of 110cm2 as shown in figure 3. The main difference between OSRAM’s offering and that of LG is the large gap in lumens per watt with the latest Orbeos OLEDs trailing with only 40lm/W. The OLED team at OSRAM are confident that the performance will soon ramp up and cite the fact they believe the Orbeos has excellent production colour consistency and the latest versions of OLED panels now have twice the brightness and lifetime as their previous generations.

Philips also launched its latest iteration of Lumiblade OLED GL350 panel which offers an unprecedented combination of lumen output and size at an attractive price-performance ratio, making OLED lighting more viable than ever before for general lighting applications.

Each square GL350 OLED panel (shown in figure 4) offers a lumen output of 115 lumens and a size of 155cm2, approximately three times larger than any existing OLED panels. It is available in sets of three panels, offering a combined light output of 350 lumens. The latest iteration of OLED panel performance means only three panels are needed compared to twelve or more previously to achieve 350 lumens.
Each GL350 panel delivers 120 lumens of light from 14.3V and 500mA (or 7.3W) giving 16.7lm/W at a CCT of 3250K and a CRI >90. The luminance is 4000cd/m2 within an active area of 103.8mm x 103.8mm and lifetime to L50 is 10,000 hours.

Philips also showed the LivingShapes Interactive Wall as an example of what can be done with OLEDs. The wall reacted to movement in front of it, which was translated into light impulses that illuminated the room in an atmospheric light. Other features include text displays, a video interface and a microphone that transforms surrounding noise into light displays. The interactive wall also distinguishes itself by its modular design. Numerous panels can be arranged either side by side or on top of one another, thus quickly creating an illuminated surface of several square metres, offering designers flexibility in the creation of lighting installations as shown in figure 5.

Sumitomo Chemical of Japan, owner of Cambridge Display Technologies, exhibited its Polymer OLED technology for the first time at Light + Building with the theme ‘The Colours of Japan – The Colours of Harmony’, in an innovative attempt to replicate - by means of lighting - the refined and traditional colours of Japan in a modern day setting of a Japanese tearoom.

The booth - created under the artistic direction of renowned Japanese lighting designer Motoko Ishii - displayed large-scale lighting panels of about 10 centimetres square each, illuminating in 60 different colours, that are produced by coating everything except for the electrodes with printing technology. Varying shades of colour soothed visitors comfortably with the world of Japanese traditional colours from the distant past.

Sumitomo Chemical is the first in the world to have successfully produced large-scale lighting panels with the printing method in so many colours showing the excellent possibilities of generating bespoke colours using this single printable layer technology.

The thickness of the polymer material is 1μm or less, and glass is used as a base substrate material. The brightness and luminous efficiency of the panel are 1,000cd/m2 and 10lm/W respectively so are still some way behind vacuum coated OLED material, however Sumitomo’s roadmap shows 60-80 lm/W by 2015.

Verbatim unveiled the world’s first colour-tuneable and dimmable OLED module that delivers a brightness of up to 2,000 cd/m2. The company’s latest series of Velve OLED modules are now twice as bright as earlier OLED devices.

The Velve OLEDs are particularly suitable for creative use in stage lighting and novel applications in disco and bar environments, offering harmonious soft-light output, integrated calibration and an even distribution of light from panel-to-panel.

Verbatim presented a new set of compact off-the-shelf modules and the company can create custom-made OLED panel sizes. One option measures 131mm x 44mm and the second is only 65mm x 72mm, a quarter of the original size. Both variants have a depth of only 5mm. The profile of the OLED modules in this series has been made smaller, thinner and lighter because its printed circuit board is no longer rear-mounted and is housed in an electronic control unit connected via cabling.

The latest series of colour-tunable VELVE OLED modules (shown in figure 7) is ideal for mood lighting with each panel delivering red, green and blue (RGB) mixed colour with illuminance of 2000 candelas per square metre at a colour temperature of 3000K.

The latest colour changing OLED panel offers a very high colour consistency which is within a 2-step MacAdam ellipse offering excellent quality of light output with good CRI as shown in table 1.

In just two years, Toshiba, one of the leading electronics manufacturers has successfully introduced its LED lighting products and solutions in Europe. Today, as a key actor, the lighting division continues to be a major innovative leader in introducing new ultra-efficient LED products and lighting technologies. It was interesting to see Toshiba’s approach to lighting given their background and they demonstrated many OLEDs on their stand as they believe OLEDs offer the next potential light source for general lighting and will equal LED performance by 2020 as shown by the slide in figure 8.

OLED applications included bracket, shelf light, suspension and desk lights on their stand as shown in figure 9.

Tridonic also launched three new OLED modules. The Luceos ROP series is ideal for decorative lighting applications and offers enormous flexibility. Products in the series can meet a wide range of requirements, from elegant table lights and accent lighting integrated into walls to wide-area effect lighting. This is because the optics, mechanics and electronics are all perfectly matched to one another. This integrated OLED module is available in hexagonal and round versions. The integrated driver electronics provides for simple and flexible integration in numerous lighting applications. Luceos ROP OLED modules are equipped with a magnetic holder which makes them easy to install and replace in lighting applications.

The dimmable modules in the Lureon REM product series are characterised by an extremely low profile. The benefits of OLEDs are apparent in stylish designer luminaires or unobtrusive area light sources. The series was developed primarily for innovative lighting concepts – whether in designer long-run office luminaires, for architectural lighting over a large area or as a fully integrated illuminated ceiling or wall.

In terms of OLED developments the current technology leader is definitely LG Chem who presented 60lm/W panels that are available immediately. LG Chem is a US$20 billion business that specialises in three segments of petrochemicals, batteries and IT & electronic materials. LG Chem started mass production of OLED panels in October 2011 with 45lm/W panels, which have already increased to 60lm/W in 2012 with CCT’s of 3000K, 3500K and 4000K. The OLED panels are some of the largest in the industry at 150mm x 150mm. The LG Chem roadmap predicts outstanding performance by 2015 as table 2 shows.
Impressively, it isn’t just performance that LG Chem are focusing upon; they believe that they have the production capacity and technology to move to a new generation (Gen 5) facility that will reduce production costs from $2000 per kiloLumen to $50-$100 by 2015 which makes OLEDs a viable general lighting solution that complements LED products.

LEDs - more efficiency, more lumens, same story   

There was of course a large number of LED based products launched from virtually all the major manufacturers and although many of the product designs certainly looked better than two years ago, when products looked like rushed prototypes in old fixtures, there was little innovation and few products caught my eye.

One that did was the Bridgelux stand with a mass of colours as shown in figure 10. The stand was created to highlight the differences in white light illumination for retail purposes as Bridgelux were demonstrating their LED arrays in a variety of colour temperatures and CRI from 80 to 98 and 2700 to over 4000K.

Bridgelux demonstrated the new Micro SM4, a multiple die emitter which is claimed to dramatically reduce the component count, cost, complexity and size of diffuse or directional lamps. The new product leverages design and manufacturing advances at Bridgelux and expands the company’s broad portfolio of solid-state lighting solutions.

The Micro SM4 component also delivers high flux density in a smaller footprint, giving designers, architects and lamp manufacturers greater freedom when it comes to creating and illuminating interior spaces.
Using only 4.2W of power, the Bridgelux Micro SM4 component will deliver between 330 and 500 lumens in both warm white (2700K and 3000K) and cool white (5600K) colour temperatures. Minimum 80 and 90 CRI options, with 3-step MacAdam Ellipse colour selections, will be offered for warm white products. The new Micro SM4 light source features the latest technical advancements in epitaxial GaN layer growth, LED chip design and automated packaging technologies.

Bridgelux emphasised that they are a world leader in LED technology on Silicon substrates and over the next two years they will look to introduce production-ready high performance LEDs based on silicon substrates that will slash the cost of LEDs and arrays significantly.
Indeed, Bridgelux has created a partnership with Toshiba to deliver high efficacy GaN on silicon LEDs that have already yielded hugely successful results that are as good as most leading LEDs manufacturers’ products based on Sapphire or Silicon Carbide substrates. For example, Bridgelux recently achieved the industry’s top results based on an 8” GaN on silicon LED chip which emitted 614mW of optical power in blue at a forward voltage less than 3.1V at 350mA with 1.1mm square chip. What is impressive is that the use of GaN on silicon not only offers lower cost materials but can use the same substrate sizes found in conventional electronics manufacturing so we could see 12” diameter production shortly which is fully automated so production costs will reduce significantly also. This is a very exciting development indeed and I look forward to production volumes which will help drive down the overall pricing of LED fixtures.

Cree also announced another industry first with a barrier-breaking 254lm/W white R&D power LED. This significant milestone exceeds Cree’s previous R&D industry record of 231 lumens per watt and is based on standard phosphor converted white technology.

Elements of Cree’s innovative SC3 Technology Platform, available today in Cree XLamp LEDs, enabled this record-breaking R&D result. The SC3 Technology Platform is built upon Cree’s advanced silicon carbide technology, features advancements in LED chip architecture and phosphor, and boasts a new package design to deliver the most advanced LED components in the industry.

Cree reports that the LED efficacy was achieved at a correlated colour temperature of 4408K. Standard room temperature, 350mA testing, was used to achieve the results.

Again, this new efficacy record shows that it will be possible to purchase LED products in the marketplace by 2015 that achieve in excess of 250 lumens per watt and this should enable the vast majority of LED fixtures to be close to 125lm/W with high performance products close to 175lm/W.

Cree also launched the new XLamp MT-G2 LED, which delivers 25 percent brighter LEDs compared to the previous MT-G, enabling a wider spectrum of high lumen applications. The MT-G2 LEDs are optimised for use in track, accent, lamp retrofit, downlighting and other applications where colour quality, consistency and optical control are required. The MT-G2 LED delivers up to 2100 lumens in warm white (3000K) at 25W, 85°C and provides one of the industry’s best colour consistencies, with superior optical control. The new, brighter MT-G2 LED shares the same footprint as the original MT-G LED (8.9mm x 8.9mm), providing customers a seamless upgrade path. The new LEDs are available in minimum 80 and 90 CRI options and feature multiple voltage selections, including higher voltages that enable the use of smaller, more efficient drivers to lower system cost.

Cree also launched the XLamp XT-E and XM-L High-Voltage LEDs to provide manufacturers more efficient, cost-effective components. Leveraging the SC3 technology platform, the brighter XT-E and XM-L High-Voltage LEDs deliver up to 22 percent more lumens than their predecessors. XLamp XT-E and XM-L High Voltage LEDs are designed to use lower cost, higher efficiency and smaller size drivers than standard-voltage LEDs. The brighter high-voltage XLamp XT-E and XM-L LEDs provide comparable performance to their standard-voltage counterparts, eliminating the trade-off of optimszing for either LED efficacy or driver efficiency.

LED Engin, a speciality high lumen LED manufacturer from the US, announced ViviLux, a new solution that offers designers a high power density light engine as shown in figure 11.

The ViviLux solution offers the following features:
• Offered as an emitter / lens combination with beam options: 24° / 35° / 45°;
• Industry-leading Lux-on-Target performance for directional applications;
• Colour Temperature of 3000K with 2 MacAdam Ellipse single bin for emitter-to-emitter consistency;
• CRI of 90; R9 minimum of 70;
• 85lm/W emitter efficiency measured at Tc=80ºC steady-state.

The system achieves the high CRI and R9 values using the same principles as other manufacturers’ that combine white LEDs with Red LEDs. Unfortunately, I don’t see colour sensors to provide accurate colour control so this may be an open loop solution which means colour quality and consistency may change according to thermal management of different fixtures.

However, it is impressive to have 40W of LED power and achieve 85lm/W at Tc=80ºC before the optics.

OSRAM announced a range of products. The Soleriq E LED arrays was the stand out product as it is OSRAM’s first real high performance LED array offering. The new Soleriq series provides, the first chip-on-board LED from OSRAM Opto Semiconductors as shown in figure 12. Even at high application temperatures they create the basis for highly efficient luminaires with a luminous flux of 1500lm to 4500lm.

The Soleriq E is available in two versions, covering the entire colour spectrum from 2700 to 6500K. Even at a temperature of 85°C, which corresponds closely to the temperature in the application, the two LEDs offer an impressive efficiency of 103lm/W at 4000K. At this temperature the larger Soleriq E45 achieves a typical brightness of 4000lm (rated current 880mA); the smaller Soleriq E30 produces a lumen output of 2700lm (at 600mA).

The Soleriq E30 comes in a package dimension of 30mm x 30mm x 1.7mm whilst the E45 package is sized at 36mm x 36mm x 1.7mm. The thermal resistances of the packages are 0.38K/W for the E30 and 0.25K/W for the E45.

Good colour homogeneity is achieved by the narrow white grouping of the Soleriq E. As standard the products come in a 4-step MacAdam ellipse option, which is not as good as other LED array manufacturers that offer three-step as standard. However for solutions that need a particularly high level of colour homogeneity, grouping based on two-step MacAdam ellipses is also available.

The LED array market is certainly getting exciting and, with OSRAM entering with a COB solution, will offer further quality competition to enable spotlight and downlight solutions to be brought to the market. Interestingly, many Chinese companies have been selling COB solutions for a few years but the colour quality and lifetime of these solutions have been substandard enabling quality LED manufacturers such as Bridgelux, Citizen and Sharp to gain a foothold in such markets. I believe with, OSRAM’s entrance into high performance LED arrays, the market will start to flourish.

Philips Lumileds launched two new LED emitter products at the show: the Luxeon M and Luxeon R. The new Luxeon M emitter has already been approved for street lighting in major US cities and fixture designs were shown at Light + Building. Luxeon M’s high lumen output - more than 1100 lumens - and typical voltage of 11.2V enables fixture manufacturers to drive down system costs and improves system performance as solutions are simpler and use fewer parts. The Luxeon M, shown in figure 13, is offered in three different correlated colour temperatures - 3000K, 4000K, and 5700K - and delivers more than 1100 lumens with a minimum CRI of 70. Every Luxeon M is hot tested and specified at 85°C and delivers Freedom from Binning.

The Luxeon R is an LED emitter designed for outdoor and industrial lighting applications such as streetlights, high-bay lights, wall packs and bollards. It is footprint compatible with Luxeon Rebel and Luxeon Rebel ES, while delivering more light output, higher efficacy and better quality of light with a minimum CRI of 70. The Luxeon R is available in CCT’s of 3000K, 4000K, 5000K, 5700K and 6500K with a minimum flux of between 160 – 200 lumens.

Samsung, the ‘sleeping giant’ of LED manufacturing, is now starting to leverage its full vertical integration (from LED materials to full product production) and number two position in LED emitter manufacturing. Their product launches must start to send shivers down the spines of the top three global lighting manufacturers. Although, until now, Samsung have predominantly used their own LEDs for flat screen TVs (they are now number one in this sector), they have started to create distribution models allowing the general lighting industry to access LED emitters and lighting panels worldwide. To put this into context, by April 2011 Samsung LED had over 5500 staff with more than 1500 staff dedicated to R&D representing more than 15%.

Samsung launched the new MP36S series mid-power LED specifically aimed at retrofit lamps and downlights as it is able to reach 130lm/W in 5000K, with full production available by October 2012 in 2700K and 5000K. The package measures 3.6mm x 2.3mm x 0.6mm as shown in figure 14 and is specifically designed for general lighting and to meet LM80 reliability testing. The MP36S has a typical Vf of 6V at 100mA so is a 0.6W LED and offers 70.2 lumens at 2700K and 88 lumens at 5000K. The mid-power LEDs offering up to 130lm/W are ideal for T5 fixture replacements and due to their low costs are highly competitive so should make a big impact. These products have a slightly higher datasheet performance to the latest OSRAM Duris E5 products also due to be released soon.

Not to be outdone on high power LED arrays, Samsung announced the HD72M series of Chip on Board (COB) solution available from 400lm to 2,600lm in a single LED package. The package dimensions come in at 31mm x 21mm x 1.4mm with 3000K and 5000K options and emitting area 18mm in diameter with a CRI of 80 as shown in figure 15. The typical Vf is 37V with a forward current of 720mA and the minimum lumens are 1920lm for 3000K and 2120lm at 5000K. The package efficacy is therefore behind those of Bridgelux, Sharp, Citizen and Osram but again it’s a step in the right direction for them.

Sharp, another well-known consumer electronics giant, launched a range of new LED products and now have a greatly expanded product portfolio with more than 100 LED modules seamlessly covering the brightness spectrum of 5 to 7,000 lumens and a large bandwidth of colour temperatures and high CRI values.

The second generation of the 10W Mini Zeni variant now offers even higher efficacy of up to 106lm/W, a greater luminous flux of up to 900lm and is available with a (typical) CRI value of 82. This new product generation is based on the technical advances made in LED production, improving the efficiency by up to 47%. Sharp has retained the dimensions of 15 x 12 x 1.6 millimetres as shown in figure 16, along with an aluminium ceramic plate as carrier material. Depending on the model, the new types offer high CRI values of 82 with a long service life of 40,000 operating hours at an operating temperature of up to 90°C in various CCT values. The new generation is specified for use with a forward voltage of 17.7V and a forward current of 480mA. But the arrays can also be operated using a current of up to 800mA, whereby values of up to 1300lm can be reached.

The new 50W Mega Zeni models maintain the same compact dimensions and high CRI values, yet with considerably greater luminous fluxes as other LED arrays. The 50W modules have a luminous efficiency of up to 100lm/W, a light output of between 3590 and 4770lm in standard operating mode and a long service life of 40,000 hours at an operating temperature of up to 90°C. The new Mega Zeni modules are designed for a forward voltage of 50V and a forward current of 950 mA, but can also be operated with a standard power source of 1050mA. Other important features include: R9 values of over 85 with CRI values of over 90; MacAdam 3-step Ellipse binning; and good colour consistency and colour stability values over time under realistic operating conditions (hot lumen).

The 50W LED array can thus replace traditional HID lamps in the same performance class. Compared to halogen lamps, the service life of 40,000 hours of the LED array is notably longer and has a much lower decrease in brightness over time. The round light emitting surface (LES), shown in figure 19, consists of a total of 160 LEDs, sub-divided into ten parallel-connected rows of sixteen. The slim design of the new Mega Zeni measures just 24mm x 20mm x 1.8mm with colour temperatures ranging from 2700 to 4000K. The LED arrays are available in a CRI of 93 in 2700 and 3000K and drops to only 92 at 4000K and offers LED efficacy of 76lm/W, 77lm/W and 81lm/W respectively, which is only a 19% drop in efficacy over the 82 CRI range.

Xicato launched two new LED models including the XLM 3000 and the XPM Point Module using their cold phosphor solution.

The XLM 3000 Artist is Xicato’s highest flux Artist Series product and is designed for applications that require perfect halogen-level colour rendering and smooth, continuous dimming to 0.1% (power).
Single-ended T4 and double-ended R7s halogen lamps have been lighting professionals’ first choice for applications such as museums, retail, hospitality, houses of worship and historic spaces. Though their light quality was high, these lamps had the drawbacks of short life and poor efficacy. The XLM 3000 Artist combines high flux with high colour rendering and is suitable for track, recessed downlight and wall wash luminaires.

As with the rest of the Artist Series Range, colour rendering is accurate across all 15 CIE standard test colours, both pastel and saturated, including the deep red and skin tone references. Ra = 90+ and 95 typical, outperforming other LED solutions, as well as compact fluorescent and compact metal halide sources. XLM Artist Series is available in correlated colour temperatures of 3000K, 3500K and 4000K.
As with all Xicato’s LED modules, the XLM 3000 Artist is colour consistent initially (1 x 2 SDCM) and over life and maintains its light level over time (L70/B50/50,000hrs).

Xicato’s new “point” module, shown in figure 18, addresses one of the last bastions of halogen accent lighting - extremely tight beams, with very high luminous intensities (such as from AR111 lamps). With an aperture of only 6mm, the new high-luminance XPM enables reflector designs with peak intensities from 7,000cd to 50,000cd, and beam angles of 10° to 3.5° as shown in figure 19.

Achieving this specification with Corrected Cold Phosphor Technology for tight initial and maintained colour maintenance is an industry first.
The new XPM is offered in both 2700K and 3000K Correlated Colour Temperatures (CCT). CRI (Ra) is 80 minimum as is CQS (Colour Quality Scale).

Keeping up with remote phosphor type solutions, Intematix launched a new remote phosphor called ChromaLit XT that provides an advanced optical coating that makes the phosphor appear more natural in colour.
ChromaLit uses a phosphor composite substrate separated from the blue LEDs. Improving on the conventional approach where phosphor coats the blue LEDs directly, ChromaLit offers glare-free, diffuse light, high colour rendering and consistent light quality. By only using a blue LED engine instead of binned white LEDs, production is streamlined and inventories are reduced. Furthermore, system efficacy is increased up to 30%, reducing lighting system material cost and power consumption.
ChromaLit XT offers a powerful and elegant solution for new applications like spotlights and floods, extending ChromaLit technology’s light quality and adding higher light intensity, 65% lower cost per lumen and enhanced off-state neutral colour when compared to conventional remote phosphors that are yellow in colour.

ChromaLit XT is optically treated to maintain an off-state neutral appearance in order to look as good off as it does on – perfect for lighting designers. The added design freedom of ChromaLit XT means users can let exposed lights like pendant lamps and downlights integrate with the rest of the space without sacrificing high performance. In highly visual environments like restaurants and hotels, ChromaLit XT allows fixtures to complement the design flow.
ChromaLit XT is available in Round, Linear and Square options and table 3 highlights its performance characteristics. Interestingly if you took the Bridgelux/Toshiba results for Blue at 0.614W of optical power (or Wrad) then you could get efficacies of 124lm/W at 3000K or 171lm/W at 4000K at significantly less costs. It will be interesting to see how remote phosphor solutions come into play as GaN on Silicon solutions come into the market place.

Of course there was also a range of Zhaga modules available from a wide variety of customers - most notably Philips, Bridgelux, Cree and GE.

And finally, true innovation   
My prize for the most impressive lighting technology on show at Light + Building was shared between the two Japanese consumer electronics companies of Toshiba and Panasonic. I have picked Toshiba because it thought beyond LEDs and picked lasers as the way to provide innovative lighting and demonstrated a concept shown in figure 20 which used a blue solid-state laser to power a series of LED lights that used remote phosphors combined with fibre optics. The solution was elegant and obviously provides an interesting combination of fibre optic lighting without the problems associated with this technology such as poor efficiency and lamp life. There are many advantages of using lasers but one is the ability to get significantly high light power densities as it can be achieved from very small points of light. A second advantage is you could change the shape of the light source from a bulb to a candle and as there was no power required at the light source it was simple to unplug one lamp and put a different one in place.

The second innovation was Panasonic’s “Nostalgic Clear” LED Lamp replacement bulb. The lamp delivers the same clear light as a 40W incandescent light bulb due to Panasonic’s unique light diffusion and heat radiation technologies as shown in figure 21. In addition, it boasts an energy saving of approximately 84 percent compared to a 40W incandescent light bulb and has a lifespan of approximately 40,000 hours, which is approximately 40 times longer than that of a traditional clear bulb.

Not only does the lamp look like an incandescent bulb when illuminated but its dimming capabilities were excellent and I would be sure that most people would prefer these types of products compared to remote phosphor or standard diffused type LED bulb retrofits. As the LED source is placed remotely from the LED driver the lifetime of the product will definitely be longer than most LED bulbs in the market today.

What will happen by the next Light + Building?   
Of course it is always risky to predict what will happen in the next two years, but I think we will see the following at the next Light + Building:
• T5’s will be completely replaced by LEDs in terms of new fixtures as well as high efficacy retrofits.
• LED prices will have decreased by over 50% and maybe as high as 70% compared to this time meaning the return on investment compared to traditional light sources for most applications will be between one and two years.
• OLEDs will be a serious player in the general lighting market and costs will have tumbled from today.
• LED fixtures will actually be able to dim properly (most of the products on show were very poor with either a poor dimming range and/or flickering of the LEDs at low intensities)
• Samsung, LG and the major Japanese electronics companies will be significant players in Europe as they use innovation, improved products and competitive pricing to break down barriers unlike in the last two to three decades.
• Standard white PC LED efficacies will reach 180lm/W in production.
• Variable CCT products will be prevalent, low cost and internet enabled.

That’s all for now but if you would like to contact me to discuss any lighting topics then email me or connect to me on

Geoff Archenhold has been seconded twice to the UK Government to support the Lighting, LED and Photonics industry and currently helps LED companies develop business plans to raise investment from the finance community. He is an active investor in LED driver and fixture manufacturers and a lighting energy consultancy. The views expressed in this article are entirely those of Geoff Archenhold and not necessarily those of mondo*arc.


Dr Geoff Archenhold
Related Articles

  • Figure 1 The 60lm/W Kindred OLED fixture from Winona Lighting.

  • Figure 2 The Revel OLED Luminaire at >52lm/W system efficacy.

  • Figure 3 The latest Orbeos SDW-058 OLED panel from OSRAM.

  • Figure 4 The new GL350 OLED panel from Philips.

  • Figure 5 The LivingShapes Interactive Wall on the Philips stand.

  • Figure 6 The Sumitomo Chemical 60 ‘Colours of Japan’ OLED stand.

  • Figure 7 The Verbatim VELVE colour tuneable OLED panels.

  • Table 1 Road map White OLED performance from LG Chem.

  • Figure 8 Toshiba’s prediction shows OLEDs will be more cost effective than LEDs by 2019.

  • Figure 9 Toshiba’s OLED suspension light.

  • Figure 10 The Bridgelux stand.

  • Figure 11 The LED Engin ViviLux high CRI Light engine solution.

  • Figure 12 The new Soleriq COB LED array from OSRAM

  • Figure 13 The Luxeon M LED emitter using 4-LED die in one package.

  • Figure 14 The new Samsung MP36S 0.6W LED emitter.

  • Figure 15 The 26W Samsung HD72M LED array emitter.

  • Figure 16 The new 10W Mini Zeni LED array from Sharp.

  • Figure 17 The new 50W LED array from Sharp in 82 and 93 CRI options.

  • Figure 18 The new Xicato XPM spot module enabling high peak intensities.

  • Figure 19 The Xicato XPM module showing peak intensities for different beam angles.

  • Table 3 The new Intermatix ChromaLit XT performance characteristics.

  • Figure 20 Toshiba demonstrates Laser lighting concepts.

  • Figure 21 Panasonic’s novel LED lamp.


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