Fluker's Sun Spot Bulb emits an ideal ratio of both UVA and UVB wavelengths, providing an excellent source of light and heat for your reptile or amphibian. Special UV-transmitting glass ensures optimum light and heat output, at 100 watts. It prevents, and can even reverse, metabolic bone disease in reptiles and helps to increase appetite, color and breeding activity. With a 5,000-hour average life, the Sun Spot bulb will keep your pet healthy and happy for quite a long time before needing to be replaced.