Gently fasten the Fluker's incandescent bulb into a Fluker Clamp Lamp or Hood or any UL approved incandescent fixture. Do not plug light fixture into an electrical socket until bulb is fastened firmly to fixture. Place light fixture outside for reptile's enclosure. NEVER place the light fixture inside the enclosure. Reptiles can develop life-threatening thermal burns from contact with an exposed light bulb. Multiple incandescent lights may be required to establish an appropriate ETR. A Fluker's thermometer can be used to monitor temperature within the reptiles's environment. Reptile behavior is directly tied to photoperiod (light cycle), so it is important to provide appropriate intervals of light and darkness. Fluker's recommends a 12-hour day/12-hour night light cycle. A Fluker's Daytime bulb should be used during the daytime cycle.