054 DOHA REPORT / QATAR NATIONAL CONVENTION CENTRE
Above The branch-like Sidra tree façade structure is repeated on both sides of the glass facade. The inner section is washed with gobo-patterned light from a line of Martin MAC 575s.
Above left The west stretch of the foyer features a leather covered wall studded with LED points that ripple with light.
Left The drop-off point at ground level features a bespoke chandelier manufactured by Aquila Design in the UK. Each two metre wide blade is created from a curved machined 25mm thick Prismex sheet, illuminated by LEDs that are concealed within the main spine. The material enables a very uniform distribution of light from only a handful of LEDs per blade. The spine is made from stainless steel with an electro polished finish.
lighting bridges, that are back-lit to provide an architectural accent. RGBW colour change LED inground recessed uplighting provides a soft colour wash to copper mesh acoustic walls. The colours may be either preset or adjusted through the main lighting desk to suit a particular event. Created as a bespoke piece by Allaeys Instruments, this inground LED extrusion was a forerunner for what would later become a commonplace technique. “I think it’s the first time RGBW was installed in an inground system,” notes Light + Design director Lee Prince. “It was specified in 2005 and back then this was pretty unusual stuff.”
The aluminium extrusion itself has an unusual double radius, so when viewed in plan it curves 90º to the left then 90º to the right, all in one extrusion. “The extrusion is also on a radius, because the theatre hall
follows the classic horseshoe geometry,” adds Prince. “The extrusion follows the curvature of the walls, it’s not faceted. So you’ve got a curved extrusion and then it returns through a left and a right bend. I don’t know of many manufacturers that can actually do that.”
LED aisle markers, also recessed in ground at the end of each seating row, provide way-finding for delegates and audiences. Erco Lightcast darklights with dimmable tungsten halogen sources provide down- lighting. “As I say, the design process was undertaken in around 2005. LED technology wasn’t available to do that job at the time, so tungsten was the only option available to us. If we were to do it now, we’d probably look to an LED solution,” says Prince. The 750 Seat Overflow Hall also benefits from a fully integrated house and produc-
tion lighting system. This hall uses an automatic lighting bar that lowers with chain climbing hoists, thus allowing rigging changes or lamp replacement to be carried out at ground level. RGBW colour change LED inground recessed uplighting provides a strong colour wash to the heavily modelled walls to wainscot level and uplighting to vertical timber-banded panels from wain- scot to ceiling plane. Pre-programmed multi scene colour changing has been provided to enhance pulbic events. LED aisle markers are also used for way finding. The Conference Hall has a capacity for 4,000 seats (or 2,000 when used as a banqueting venue). LED colour changing back-lit disc panels provide ambient light for the space. These can be lowered to the floor for maintenance purposes. Circular dynamic lighting trusses with controlled
Pic: Robert White
Pic: Robert White
Pic: Lee Prince
Pic: Robert White
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