Building and Stage Lighting
In stage lighting, sealed beam lamps are often used. A common size, also used in rock concerts, as well as outdoor architectural lighting, is the parabolic aluminumized reflector 64 (PAR64). PAR64 sealed beam lamps are typically available with 250, 500 or 1000 watt power ratings.The fixtures that such sealed beam lights go into are called "PAR cans". Beam spreads are designated as FL (flood), SP (spot), NSP (narrow spot), and VNSP (very narrow spot), as stamped on the back of the lamp's reflector.
Read more about this topic: Sealed Beam
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