The Solution
HOW WE ACHIEVED THE RESULT
At this stage, it was decided that the Galleria should be illuminated using the new Holophane Prismpack. Whilst normally used in industrial situations, the client chose the Prismpack because of its flexibility, wide range of lumen packages and beam options and the aesthetics of the architectural steelwork used in the canopy. This recently launched version of the IP65 Prismpack is available in a range of sizes that can deliver from 10,000 lumens to over 120,000 lm. This is achieved by combining a single LED module (up to 20,000 lm each) in groups of one to six. For the Galleria, the single-module, 20,000 lumens, version was used.
In keeping with the retail and leisure activities in the space, this version of the Prismpack has a colour rendering greater than CRI 80 and a Neutral 4000K appearance. One of the key benefits of the new Prismpack is the Optimax optical system. This has miniature, facetted, specular aluminium reflectors within a low-iron (for maximum light transmittance) glass lens. The LEDs themselves are set deep in the Optimax reflector thus avoiding any chance of a direct view of the source. To punch the light down to ground level from the 19-metre-high glazed roof, a narrow beam version of the Prismpack was used with a cut-off at approximately 30 degrees. The result is an almost glare free installation with excellent uniformity.