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PAR20, PAR30 & PAR38 BULBS
PAR = Parabolic Aluminized Reflector. The number is the diameter of the bulb times 8, so divide by 8 to get its diameter. Thus, a PAR30 is a 3.75" diameter bulb. Our last house had PAR30 floods in track lighting in the living room (a style that was all the rage when the house was built in the 1980s)