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Parabolic aluminized reflector (PAR) 38 LED bulbs control light more precisely. They produce about four times the concentrated light intensity of general service A shape incandescents, and are used in recessed and track lighting. Like all light bulbs, the 30 value represents the diameter of the bulb in 1⁄8 of an inch. Therefore, PAR 38 is 4.75 inches in diameter.