More UVB than any other fluorescent tube! The Zoo Med ReptiSun 10.0 High Output UVB bulb is the newest advancement in reptile UVB lighting. Effective at distances up to 20” (compared to 12” with the ReptiSun 5.0). Taller habitats, screen cages, and tank covers can all reduce the amount of UVB reaching your reptiles; the high output of the ReptiSun 10.0 will ensure that your reptile receives beneficial levels of UVB even from a distance. UVB emissions last one year before lamp needs to be replaced. T-8 bulb.