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Incandescent-light-bulb-base-sizes, find the lightbulbs shape you’re looking for with this visual chart- detailed illustrations of bulb shapes include a19, mr16, par, and linear fluorescent tubes.. Our flat rate for ground shipping to the 48 contiguous states is $8.99. for alaska/hawaii, the base rate is $27.59 and surcharges may apply for larger orders., find the light bulb base type you’re looking for with this visual chart- detailed illustrations of general bases, fluorescent bases and specialty halogen base types.. The most common bulb base in the us is the screw medium e26 base. it is used in most incandescent, nostalgic, led, cfl and halogen light bulbs. the candelabra e12 base is the second most common bulb base which is used for smaller decorative incandescent/nostalgic bulbs. the intermediate e17 base is not very common., ordinary 40-watt and 75-watt bulbs are a-19, with a few a-21. the size of the base or the shape and size of the bulb are not sure signs of the bulb's wattage or voltage. bulbs are made for 12 volts, 100 volts, 115 volts, 130 volts and 250 volts..

The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. the most commonly used household bulb is the a-19. the bulb is "a" type and the diameter would be 2 3/8" a 120br40 is a 120-watt reflector 5" in diameter. color temperature (kelvins) reference guide, e17, “intermediate” base, is in between these two sizes. it’s sometimes used for desk lamps and appliance bulbs, but is not as common. the large e39 “mogul” base is used on street lights, and high-wattage lamps (such as a 100/200/300 watt three-way). chances are you won’t have a need for these guys..

A 230-volt incandescent light bulb with a medium-sized e27 (edison 27 mm) male screw base. the filament is visible as the mostly horizontal line between the vertical supply wires. an sem image of the tungsten filament of an incandescent light bulb.