Perimeter luminaires are linear luminaires with a wide-beamed characteristic for evenly illuminating vertical surfaces. Perimeter lighting refers to a lighting concept whereby fluorescent lamps are sunk directly into a joint to the wall. These luminaires are available with or without reflector. A higher, even quality of lighting is obtained however by luminaires with reflectors and set a distance from the wall...The low luminance and linear format of fluorescent lamps result in a low briliance.

Criteria for perimeter luminaires
- uniformity: optimised reflector for even illumination of areas