Zillas Tropical 25 UVB Fluorescent Coil Bulbs are ideal for those tropical-dwelling basking reptiles such as Anoles, Day Geckos, Tokay Geckos, Iguanas, Basilisks, Chameleons, Chinese Water Dragons, Red-Eared Sliders, Red Foot Tortoises and Eastern Box Turtles.Provides UVB light for proper calcium development in tropical reptilesFull spectrum illumination brings out subtle reptile colorsEnergy efficient bulb lowers energy costsStandard terrarium bulbs cannot deliver the needed levels of UVB radiation which is a vital compenent in healthy bone development for your reptile! These bulbs deliver the needs with 25 microwatts per second/cm2 of UVB and with essential UVA light as well.Additional Features:Delivers additonal UVB light for strong bonesColor correcting visible light helps brighten colorsHelps recreate the healthy light of the tropical rainforestIdeal bulb for basking reptilesProduces optimal amounts of UVB and UVAUp to 5,000 hours of lamp lifeThis energy-efficient bulb simulates natural sunlight and produces UVB (3%) and UVA (15%), with up to 5,000 hours of lamp life. This bulb is designed for use with all ESU Reptile Heat and Light Reflector Domes. UV Index: 1-3 at 12" distance.Tropical 25 bulbs are designed to last 3500 hours or 12 months on average use.