UCO 15-Hour Candles – Now with Even Longer Burn Time Reliable light when you need it most. Whether you're camping off the grid, preparing for a storm, or building your emergency kit, UCO’s 15-Hour Emergency Candles offer long-lasting, clean-burning performance for all your power outage and off-grid lighting needs. Designed specifically for use with UCO Candle Lanterns, these candles deliver consistent burn times of up to 15 hours each in a controlled lantern environment. Even when burned in open air, you'll get a solid 12–15 hours of dependable light. They’re compact, lightweight, and ready for everything from tent setups to hurricane kits , blackout prep , and bug-out bags . Simple. Dependable. Safe. These long-burning candles are an essential light source for anyone who wants peace of mind during uncertain times—whether you're deep in the backcountry or riding out a storm at home. Burn Time That Lasts Up to 15 hours when used in a UCO Candle Lantern for maximum efficiency. 9–12 hours outside of a candle lantern. Open air (wind and temperature may affect longevity).