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A GU24 connector is fitting for compact fluorescent light bulbs (CFL) that uses a bayonet mount bi-pin connector instead of the Edison screw fitting used on many incandescent light bulbs. The GU24 fitting allows the overall length of the bulb to be shorter since the threaded base is eliminated.
- Use of the GU24 fitting provides compliance with a 2008 ruling by the California Energy Commission under Title 24 (California Building Standards Code) to require high-efficiency lighting on all residential remodels and new construction. The GU24 fitting maintains the energy efficiency of the light by preventing an occupant from using an incandescent bulb instead of a CFL. Adapters to use incandescent bulbs in a GU24 fitting are illegal in the State of California as they would be a fire hazard in fixtures designed for the lower heat output of a CFL bulb.
- The GU24 fitting is not compatible with older light fixtures designed for incandescent bulbs, whereas a CFL with an Edison screw fitting is a direct replacement for an incandescent bulb.
- GU24: New Pin-Base for CFLs, LEDs, Environmental Building News, October 1, 2011