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What is the definition of PAR in a PAR 20 or PAR 50 light bulb?
Wiki User
∙ 13y ago
PAR is a outside rated light bulb - R is a indoor rated light bulb.
PAR30 = outdoor flood bulb (spot light)
R30 = indoor flood bulb (recess can) From MBT lighting & Sound. They are a commercial lighting group. I'm not sure about the indoor (R) / outdoor (PAR) differentiation posted above but the number after PAR refers to the diameter of the bulb. PAR30 would have a 3-3/4" diameter. I verified several PAR sizes. The below explanation is correct: "No, PAR is not referring to the Golf game; PAR (Parabolic Aluminized Reflector) is actually the description of the lamp or bulb that goes inside a PARcan. The can is the container where the PAR lamp or bulb goes. The number beside PAR is a measurement that describes the diameter of the PAR lamp or bulb. To figure out the diameter, divide the number next to PAR by eight. For example, if you have a PAR64, divide 64 by 8 and you will have an 8-inch diameter lamp. PAR56 has a 7-inch diameter lamp, and PAR46 has a 5.75-inch diameter lamp, and so on. The diameter of the PAR lamp is useful to know when ordering a replacement lamp."
Wiki User
∙ 16y ago
Wiki User
∙ 13y ago'PAR' in PAR 20 or PAR 50 is an acronym standing for "Parabolic Aluminized Reflector". This name refers to the construction of the PAR bulb. The bulb traditionally features a tungsten filament surrounded by a reflector with an aluminum coating (hence aluminized). The reflector intensifies the beam and makes it more efficient. "Parabolic" has to do with the flat ovular shaped pool of light the bulb gives off.
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