
168 Luminaires
details. These luminaires can be pole mounted to illuminate streets and parking
lots or mounted in the ground at low levels for illuminating walkways.
Some of the most expensive and sophisticated lighting systems are those used
in professional applications such as stage lighting. Here, again, the categorization
takes place depending on whether the luminaire is used for oodlighting or as a
spotlight. Some widely used oodlight systems are discussed next.
The parabolic aluminized reector lights, or PAR lights, or PAR cans, are
nonfocusable instruments. PAR cans consist mainly of a metal cylinder with a
sealed-beam parabolic reector ...