The perfect uvb bulb for your pets, the YauldSun 100W UVB UVA Reptile Basking Heat Light Bulb is a great way to give your reptiles a boost with its powerful rays. Made of mercury vapor, this bulb provides a bright, warm glow that will keep your reptiles comfortable and help them thrive. With a wattage of 100 watts, this bulb is strong enough to provide a warm spot even on cold days. The YauldSun 100W UVB UVA Reptile Basking Heat Light Bulb is easy to install and comes with a long lifespan of 20,000 hours or more.