Get up to 3 hours of emergency battery backup lighting if you lose power with the Feit Electric Backup Battery LED Bulb. Reliable, rechargeable emergency lighting, this bulb turns on even during blackouts. Install Battery Backup Light Bulbs and make frantic situations less frantic. They're perfect for locations that have frequent storms or power surges. No more hunting in the dark for flashlights and candles. A21 shape backup bulbs fit in a standard E26 light bulb fixture and work just like a regular bulb until the power goes out. When the power cuts out, they switch to battery power and continue to shine. OM60/927CA/BATG2LEDI bulbs use just 8.8 watts while providing a similar 800-lumen light compared to 60-watt incandescent bulbs. Save 85% on energy costs with the same Soft White 2700K glow. Enhance LED light with 90+ color rendering makes colors appear vibrant and skin tones look more natural, all while saving energy and lasting for a decade or more.