How to use?Insert the lamp head into the lamp slot of fixture and rotate it half a turn into place.Use distance:Please adjust the distance between the bulb and the pet, it is recommended to be greater than 30cm (12 inches).Question: The difference with Compact Fluorescent Reptile Bulb ?Answer:Long fluorescent lamp has a wider illumination range.Question: What's the difference between 5.0 and 10.0 ?Answer:5.0 indicates that 5% of the transmitted light is UVB. 10.0 indicates that 10% of the transmitted light is UVB.Question: How often to replace the bulb?Answer:Replace it every 6-12 months according to the frequency of use.Reptiles use the UVB rays from the sun to produce vitamin D3 and properly absorb calcium.Indoor reptile pets don't get enough light, so having our uvb bulbs to keep them healthy. uvb 5.0 bulbs provide safe and stable UVB(5%) and UVA output. No harmful UVC output.our uvb fluorescent lamp doesn't hurt the reptile's eyes or burn the skin. Reptile uvb 5.0 light bulb suitable for all tropical and subtropical reptiles such as chameleons, turtles, lizards and more.