Available in 24W, 39W and 54W (22", 34" and 46" lengths). The Arcadia Reptile Dragon lamp is a bold, white, full spectrum and VERY bright High Output T5 UVB projection lamp for captive reptiles. The lamp represents an almost doubling of light (LUX) and has a CRI of over 95 which will enable you as the keeper to see your animal in all of its natural glory. Upper index basking for a desert species is set at a massive 15 or 35-40cm from the reflected lamp to the animal back at the basking or shortest point. Making this lamp simply perfect to be used in vivaria of 20/50cm high or more. It will also help greatly for those that use terraria with a mesh top.