PAR lights, or Parabolic 350-030 aluminized reflector light, are often referred to as Parcans. They are normally a single lamp/reflector unit, that looks similar to a car headlight inside a metal can, which has the appearance of a sausage. Parcans can come in a variety of different sizes, anywhere between a Par16, which is based around an MR16 lamp and the whole unit is approximately 3 inches long, to a Par64, which utilises a much bigger 350-001 lamp and is around 2 feet long.
The number following PAR [PAR 64, 38, 16 etc] refers to the diameter of the lenses of the lamp. The formula being n/8 inch = diameter. [ie: a Par64 is 8 inches in diameter]
Parcans have a much greater usage outside of the theatre industry, and are used large amounts for music concerts and tours. 640-802 If large areas need to be lit, a 3 x 3 grid of Parcans is useful, which is known as a "nine-light".
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