Zoo Med Reptisun 10.0 UVB Mini Compact FluorescentIdeal for small terrariums 10% UVB output, 30% UVA output, full spectrum Special UVB transmitting quartz glass for maximum UVB penetration Cool burning compact fluorescent bulbs screw into standard threaded sockets, eliminating the need for a separate ballast Can be oriented vertically or horizontally in the hood or clamp lamp fixture Helps prevent or reverse metabolic bone disease