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"PAR" is an acronym for "Parabolic Aluminized Reflector", this refers to the shape and design of the light bulb.The commons sizes of PAR lamps are: PAR-16 (PAR16) is 16 eighths of an inch in diameter across the face of the bulb, or 2.0" (25.4mm) Maximum Outer Diameter. PAR-20 (PAR20) is 20 eighths of an inch in diameter or 2.5" (63.5mm) Maximum Outer Diameter. PAR-30 (PAR30) or 30 eighths of an inch in diameter or 3.75" (95.25mm) Maximum Outer Diameter. PAR-36 (PAR36) is 36 eighths of an inch in diameter or 4.50" (114.3mm) Maximum Outer Diameter. PAR-38 (PAR38) is 38 eighths of an inch in diameter or 4.75" (120.65mm) Maximum Outer Diameter. PAR-46 (PAR46) is 46 eighths of an inch in diameter or 5.75" (146.05mm) Maximum Outer Diameter. PAR-56 (PAR56) is 56 eighths of an inch in diameter or 7.00" (177.8mm) Maximum Outer Diameter. PAR-64 (PAR64) is 64 eighths of an inch in diameter or 8.0" (203.2mm) Maximum Outer Diameter.
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