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The key technical issues for choosing any fitting are lamp way (lumen output) and LOR (light output ratio).

LOR tells you how efficient the fitting is at allowing the light generated by the lamp to exit the fitting and is given as a percentage. So, anoraks on, and into the fray.

In no particular order:

KOMETA FROM CONCORD: MARLIN Lamp way: 1 x 32W TC-T + 40W Circular T5 LOR: 61 per cent Kometa offers an innovative workplace lighting solution, which also answers the technical challenge of illuminating major room surfaces from one luminaire. A key design feature is its potential for light-pattern variation, with the different elements of the downlight and the ambient ring being controllable individually. Ceiling projection (54mm), two lamp ways (32W TC-T in the downlight and the 40W TS in an opal drum) give the opportunity for separate dimming, allowing variation in luminaire light pattern.

QUADRATURE FROM SITECO Lamp way: from 4 x 14W T5 to 2 x 54W T5 and all stops in between LOR: 70 per cent The major feature of the latest Quadrature generation is the newly developed all-microprismatic Eldacon plate. This means the visual appearance of the prismatic structures is now unbroken. Glare-free Eldacon microprismatic technology makes the range especially suited to lighting situations such as those at computer and CAD workstations and video conference rooms. This is a light-control technology in which the light provided by the T5 fluorescent lamps is directed into the room via microprisms.

362 SERIES FROM TRILUX Lamp way - 2/3 x 24W T5 (600 x 600) 2 x 28 (1,200 x 300) LOR: 67 per cent (0.67) Projecting slightly from the ceiling (61mm), the simple design creates the all-important visual brightness across the ceiling by having luminous sections either side of the light delivering UXP-Technology louvre optic.

Modularity is a key element with fittings available from 600 x 600mm to 1,500 x 300mm and sizes in-between.

MELLOW LIGHT IV FROM ZUMTOBEL STAFF LIGHTING Lamp way: 2 x 24W T5 (600 x 600) 2 x 28W (1,200 x 300) LOR: 59 per cent (with mesh) or 75 per cent (with louvre) A minimalist semi-recessed luminaire that complements the subtleties and changing nature of daylight. The luminaire emits even light distribution across the primary visual surfaces, giving an impression of increased brightness without increased energy consumption. All-round glare control protects the eye from the light source at all angles.

UM1 WITH MESOOPTICS FROM ETAP LIGHTING Lamp way: 2 x 24W T5 (600 x 600) or 2 x28W T5/2 x 54W (1,200 x 300) LOR: 83 per cent MesoOptics is an innovative technology that allows a very fi ne micro-structure to be created that spreads light in a controlled manner. There are hardly any reflections because of the thin film. These optics have an efficiency of 92 per cent.

UM1 luminaires with MesoOptics have a higher efficiency (30 per cent) than traditional diffusers. Fewer luminaires are therefore required, as is less installed power.

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