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=== A19 bulb ===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.