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The IP65 rated SIL LED Window reveal light features a total light output of 72 lumens with a luminaire efficacy of almost 19lm/W from a single 3 watt LED.


versions may be introduced. I was surprised to note the low efficiency of the luminaire with 3.79 watts input power producing only 72 lumens output, giving 18.9 lumens per watt. I assume that this is due to optical losses through the lens and cover moulding but perhaps thermal issues are also reducing performance. The SIL incorporates a simple mechanical adjustment so that the light output can be adjusted to the desired angle. While the mechanism cannot be locked the hinge screws can be tightened after installation but this would be very fiddly in many situ- ations. Despite the small size of the SIL it incor- porates a 4 watt mains voltage constant current driver to run the XT-E LED. This driver is from a little-known Chinese brand and is the smallest line voltage driver of this power I have seen so far. The SIL has a single flying lead cable entry with a compression gland entry but no


provision to terminate cables within the luminaire. The Meyer and Sill products both allow for looping wiring in and out with internal wiring connection which, although requiring much more space, is a useful feature for installers. Although the luminaire is highly attractive and compact, the internal construction and LED thermal management in the sample I was given did cause me a few concerns but this was a pre-production sample produced rapidly for the ARC show so it would not be fair to comment about that in this review. Hopefully these concerns will be addressed prior to full production. However I did won- der if the insulating moulded plastic body that encloses the primary heat sink would limit heat from radiating to the outer atmo- sphere as this is an integral part of the de- sign. I understand that the KDDC technical team in Korea have fully tested the product and that the LED is running within limits. I also wondered what provision had been


made to prevent UV yellowing of the clear window in the plastic moulding given the potential high levels of direct exposure to sunlight. The area around the clear window has been painted satin black and this paint has a three year warranty. The Meyer and Sill products incorporate glass windows that do not yellow with sunlight exposure. I am sure that the KDDC SIL will be a very useful and successful product in smaller scale projects where limited light levels are required. The lit effect is very pleasing and the detail appearance and size of the luminaire are well considered. www.kkdc.co.uk


David Morgan runs David Morgan Associates, a London-based international design consultancy specialising in luminaire design and development. www.dmadesign.co.uk


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