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TECHNOLOGY / PRODUCT REVIEW
WINDOW SILL
While trawling the aisles of The ARC Show, David Morgan finds a niche product with remarkable performance and a proud pedigree... the Sill WindowLighter
The WindowLighter was developed by Licht Kunst Licht and Sill for the specific task of illuminating exterior window reveals. A combination of elliptical and symmetrical TIR lenses with different beam shapes control the initial light output from the Luxeon Rebel LEDs. The light then passes through a three panel secondary ribbed glass lens which is bonded into the cast cover blending the light pattern together to create a homogenous blade of light
Making its UK debut at The ARC Show was the WindowLighter from Sill Lighting – the company known for the quality, efficiency and sophistication of its technical lighting products and especially its exterior flood- lights and projectors.
This luminaire is designed to undertake one specific lighting task which, as the name implies, is to illuminate the exterior window reveals of multi-storey buildings without spilling stray light either into the building or out to the sky.
This new luminaire design has emerged from a cooperation between Sill and one of Germany’s top lighting design practices to create a low-profile, aesthetically neutral fitting to sit discreetly on a window sill - capable of edge-to-edge lighting of the window reveal. The WindowLighter sits on the window sill and projects light out in an arc of around 200 degrees with a very narrow beam of around 5 degrees. The output from the
optical system pushes light away from the building at around 15 degrees but as the mounting bracket is adjustable and lockable this angle can be controlled to achieve the desired effect as required. The mounting bracket and cable entries are located away from the window side of the luminaire so the view from the building is very minimal. This very shallow luminaire is only 100mm deep and is designed to cause as little disturbance to the view or create any glare when viewed from within the building. The WindowLighter can also be used for façade lighting where the luminaire is reversed so that the beam is directed back towards the building and is mounted on an extended bracket.
The original concept for the WindowLighter came from the well-known lighting de- signers Licht Kunst Licht in Berlin and the development was then handled in-house at Sill by the technical director Mr. Feldmann. Already, two projects have been completed
with this product in France and Switzerland. Sill has been in business since 1954 and, as one would expect with a company of such repute and longevity in the sector, the design and engineering of the Window- Lighter is well done. Since this is a niche product for a rather specific application and is therefore unlikely to sell in high volumes, Sill appears to have sensibly used good qual- ity off-the-shelf components and low tooling cost processes to launch the product. To create the 200° distribution each of the 9 x 3W LEDs is mounted at a different angle onto the cast enclosure. Each of the Luxeon Rebel LEDs is mounted on aluminium star pcbs to the generous cast heat sink bosses. In normal operation in a 25 degree ambient the housing runs very cool and, although the passive cooling system is rated for use up to 35°C, this is likely to be a very conservative rating given the power and overall surface area of the luminaire. Sill has kept to a minimum any unnecessary surface ‘heat
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