Aiicioo UVB Reptile Light Bulb - Fluorescent Desert Bulb 10.0 Compact Tropical Terrarium Lamp for Reptile Calcium Supplement No light emitted no harm and effect the sleeping habits of reptile,chickens coops Keep snakes cage warm and keep water in chicken coop from freezing Perfect for high humidity terrariums 24 hour heat Flat design s more efficient and longer lasting Dog,reptile and bollded pets love it