Now you can set the mood for your pet with Fluker's UL/CUL approved new clamp lamp with dimmer. All sizes feature safety clamps and easily attach to the 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 vapour bulbs. To use these bulbs the dimmer switch must be turned completely on.