Common Residential Light Bulb Socket Types in North America
E26 Edison Screw
In the designation 'Exx', 'E' stands for 'Edison' and 'xx' refers to the diameter in millimeters as measured across the peaks of the thread on the base. In Europe the designation is E27 which is nearly the exact same size.
A19 bulb with E26 base
The most commonly used A-series light bulb with an E26 base is the A19 bulb. The A19 designation refers to the width of the bulb in one-eighth inch units. When speaking about the bulb, we say A19, and the base we say E26.
The common A19 bulb is 2 3/8 inches wide, 4 3/8 inches long, and has a one inch E26 base. These bulbs were originally of the incandescent type, burning a tungsten wire filament to produce light.
GU24
The GU24 socket and base system is designed to replace the Edison socket and base in energy efficient lighting fixtures. The California Energy Commission prohibits adapters that would allow the use of screw-in bulbs on a GU24 base. This is to prevent people from using normal incandescent bulbs.
The GU24 base has two dual-diameter pins. The smaller portion has a diameter of 3.4mm (0.13") and the larger portion has a diameter of 5mm (0.2").
A19 bulb with GU24 base
As explained in Common Residential Light Bulb Socket Types in North America the shape of the bulb as described as A19 represents the common shape that most people are familiar with. The A19 bulb was traditionally available with the E26 Edison Screw base. Now as a result of new Government regulations, it is common to see the A19 bulb with the GU24 socket base system.
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