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Light Bulbs: Know the Different Types
Incandescent lamps come in various shapes and sizes, all designated by a letter or letters followed by a number. The letter is to identify the lamp’s shape while the numerical designation is to identify the diameter of the lamp in an eighth of an inch.
60: Wattage (60 W)
A: Bulb shape
19: Maximum bulb diameter, in eighths of an inch. (19 ÷ 8 = 2.38 in)