GU24 Light Bulb Socket

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.