Luminaires for lighting purposes are classified according to various criteria, namely according to their type of use, as either purpose-designed luminaires for lighting work rooms and common rooms; luminaires for living quarters used to light private rooms; representative lights designed in an artistic fashion solely for lighting representative rooms; or according to type and location of installation as stationary luminaires which are permanently installed at their place of installation, either as recessed luminaires, surface-mounted luminaires or suspended luminaires; portable luminaires which can be moved during operation. This includes free-standing luminaires or luminaires for tracks; adjustable luminaires which are permanently installed at their place of installation but feature a photometric portion which can be rotated or moved e.g. using joints, pulling devices, scissor arms etc.; or according to cover type as open-distribution luminaires; reflector luminaires; louvre luminaires; diffuser luminaires; luminaires with flat covers; or according to distribution characteristics as narrow-distribution; wide-distribution; uniform-distribution; upward-distribution (indirect distribution); downward-upward-distribution (direct-indirect-distribution), and diagonal-distribution (asymmetric-distribution) luminaires.
