Smart Electric 251 30-Minute Auto-Off 42-watt Halogen Smart Timer Bulb with Standard Base Socket, Clear Stays on for a period of 30-minutes and warns you by blinking a minute prior to shutting down Produces 780-lumens for standard room lighting Features a clear finish and is compatible with standard base sockets Soft Start technology eliminates electrical shock to the filament to last 2-times longer 2-year unconditional guarantee