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Delta Light

Power Flower

Issue 39 Oct / Nov 2007

David Morgan enjoys a Summer of Love with the Power Flower.

Perhaps as a response to the current interest in 1960’s retro, Delta Light has named its new multi LED pendant light the Power Flower. The name apart, this is definitely a 21st century luminaire.

Delta Light is one of the clutch of Belgian architectural lighting companies who have done so well in the international lighting market over the past 20 years with a clean minimal luminaire style and the refined application of the latest light sources. Delta Light now sells in 74 countries worldwide.

Delta Light founder Paul Ameloot who designed the Power Flower as well as most of the rest of the product range started life as a high end consumer electronics retailer and started the lighting company in 1987.

The Power Flower incorporates seven one Watt white LEDs in a ingeniously designed configuration. Six of the LEDs can be angled in the horizontal plane around a central cylinder incorporating another LED. By adjusting the angle of the LEDs the resulting light pattern can be adjusted from a bright central spot to a series of 7 dispersed individual spots

The TIR lenses incorporated in each LED petal provide a well defined and neat 25 degree beam pattern. There was some colour variation between the seven cool white LEDs in my sample but when focused together into one spot of light this was not evident.

As a pendant light the Power Flower works well although there is some glare from spill light coming from an internal rib and other details within the TIR lenses. When suspended at 600 mm above head height this is not uncomfortable as long as all the LEDs are all pointing down or inwards. There is also a wall / ceiling mounted version that appears to be designed more for accent lighting applications where this would not be a problem.

The measured lighting performance is quite impressive. I tried a comparison between the Power Flower and a 10 Watt MR16 21 degree medium beam LV lamp. The Power Flower gives a peak intensity of 300 lux when suspended 600 mm above the working surface with a 250 mm diameter of light to half peak intensity. This compares to 370 lux peak for the 10 Watt MR 16 with a diameter of only 140 mm to half peak intensity. Although the MR 16 lamp gives a bit more punch in the centre of the beam the overall light output seems to be significantly lower indicating the lower efficiency of the halogen source at this wattage.

The measured power consumption of the Power Flower seems to be around 11 or 12 Watts including the remote driver so the actual efficacy of the luminaire and driver is probably around 27 lumens per Watt. This is a typical efficiency for white LED luminaires at the moment.

The Power Flower is neatly designed in the minimalist idiom and looks good. However the exposed wires feeding each LED do detract from the overall appearance and the lack of any adjustment lock means that the individual LED petals could be easily knocked into the wrong angle giving a potential glare problem.

Power Flower uses the cool running characteristics of LEDs to full advantage in creating a hand adjustable variable distribution pendant – a novel and playful use of LED lighting technology.

With the distinction of being used above this season’s Big Brother dining table as a pendant the Power Flower is likely to become an iconic and much copied LED luminaire.


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