Now you can set the mood for your pet with Fluker's UL/CUL approved new clamp lamp woth dimmer. Ceramic sockets are rated for incandescent bulbs. All sizes feature safety clamps and easily attach to the rim of all terrariums. DIRECTIONS: Set lamp high at one end of terrarium; pet may retreat to cooler side if desired. Provide structure allowing pet top climb up toward lamp. DO NOT put food or water under lamp! Dimming option does NOT work for compact fluorescent or mercury vapor bulbs. To use these bulbs the dimmer switch must be turned completely on.