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What does PAR mean? PAR is a unit of bulb measurement.
PAR is also a unit of bulb measurement. In this system of lamp identification the first number listed denotes the maximum diameter of the lamp expressed as a number of 1/8's of an inch. For example, some common sizes are:
PAR-38 (4.75")
PAR-30 (3.75")
PAR-20 (2.5")
All of our bulbs currently are “medium” or “Edison” base; which means they will fit into most sockets in the US.