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PJR Panorama seamless luminaires

Issue 66 Apr/ May 2012

After visiting this year’s ARC Show, our product reviewer David Morgan takes a look at the Panorama series of seamless luminaires from PJR Engineering.

PJR Engineering is one of the UK lighting industry’s best kept secrets. Started back in 1974 as a general sheet metal supplier, it became one of Linolite suppliers. When Linolite was absorbed into the Concord lighting group three members of the Linolite design and development team took over PJR and started to create and produce their own lighting products both as an OEM supplier and also under their own brand.

Currently their main markets are the UK and Middle East with most of the PJR products being linear fluorescent. Sales are increasing in the architectural lighting market and this is the target area for future development.

Architects and lighting designers have always liked the effect of indirect cove lighting. Using standard linear fluorescent lamps can work well in this application if the lamps can be staggered to reduce the dark areas at the lamp ends. If staggering is not possible then cold cathode systems are available to create a continuous and seamless effect in smaller coves but this is a more expensive option and they operate at high voltage with bulky remote ballasts. Seamless fluorescent lamps create a similar lit effect on straight runs to cold cathode but with lower initial costs and work with integral ballasts. With an easily replaceable, off the shelf lamp, the long term maintenance costs are also much lower.

Seamless fluorescent lighting systems probably originated with Nippo, the Japanese lighting company, who in 1997 developed a T6 linear fluorescent lamp with non-standard connection pins mounted on the side of the tube instead of at the ends thus allowing the tubes to mount end to end and the dark areas between lamps to be eliminated.

Soon afterwards Feelux from Korea developed a different design approach based on a T5 tube with an additional off centre mini connection T5 tube so that conventional T5 lampholders could be used.

As a luminaire manufacturer, Feelux did not market the lamps to other lighting companies so it was not until Osram licensed the Feelux design a few years ago and started producing their own seamless lamps that PJR and other companies had the opportunity to develop luminaires based on these lamps.

PJR was quick to see the opportunity for seamless linear lighting when Osram introduced their Seamless Lumilux lamps and have now developed a surprisingly large range of luminaires for these lamps.

The PJR Panorama Seamless Professional is the workhorse of the range for use in concealed cove lighting applications and comes in starter and joiner versions. With a slim body housing the ballast, the profile of the system is only 59mm high x 40mm wide. The starter unit comes with a flying lead to keep the size of the body as small as possible and to allow for flexibility of feed point in the cove. The joiner units plug onto the starter with a five-way connector and locking cover plate. It is available in three lengths – nominal 600mm, 900mm and 1,200mm - with both high output and high efficiency lamp options. Dimming is available with integral Osram DALI ballasts or 1 – 10 V ballasts.

Fixing the luminaire in place is very simple and is achieved without having to open the body with the use of two neatly designed, turned aluminium fixing conduits. Relamping is simply achieved with push in / pull out type lampholders so the cove can be made more or less the same width as the luminaire.

For applications where an exposed lamp would be a problem, PJR has developed the Panorama Diffusion version which incorporates an extruded reeded diffuser fitted to the body. A range of colour gels are available which fit into the diffuser to provide a fixed colour effect.

There is a twin lamp version which can be used on larger projects and provides twice the light output of the single lamp version. Fitted with twin ballasts this version can also be used to provide adjustable colour temperature effects where different colour temperature lamps are used and each lamp is dimmed individually to provide the colour shift effect.

A flexible version is also available to allow use in curved cove applications. Due to the minimum lamp length of 600mm the minimum bend radius is fairly large but in many situations that will not be a problem. The five-way connector is mounted vertically to allow the connection between luminaires to flex. This allows a ring of luminaires to be created which could be as small as 1.7m with 8 x 14W HE or 24W HO lamps.

The recessed version uses the same body as the Diffusion design in an additional housing and allows long runs of continuous lighting without dark areas between lamps. The samples shown at The ARC Show incorporated a diffuser panel graded to meet Part L energy efficiency. This allowed quite a clear lamp image when viewed directly from below. It is understood that a more diffuse material will also be available to give a more fully flashed effect but with a consequential loss of efficiency.

PJR are able to supply the recessed version in a variety of lengths up to 3.6m in a single piece housing which reduces the amount of onsite work needed to join shorter modules.

The Panorama seamless range takes PJR into a more architectural area of the lighting market and is a well-engineered system making the most of all the possibilities afforded by the Osram Seamless Lumilux lamps.

PJR should do very well with this range although in the medium term it seems likely that LED systems will capture an increasing share of the architectural cove lighting market.


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