Dusk-to-dawn 23W (watt) fluorescent patio light (compliant to California Title 24 high efficiency standard). RoHS compliant. ENERGY STAR compliant. UL (Underwriter's Laboratories) listed for wet locations. Heavy-duty die-cast aluminum housing and frosted high-impact protective lens. Turns On at dusk and Off at dawn. Requires (1) 13W to 23W GU24 CFL (compact fluorescent) bulb. (1) 23W GU24 CFL bulb is included with fixture.