No Light Emitted - This 25w heat lamp bulb only generates heat during use, and does not emit light. Especially when it is used at night, it will not affect the pet's sleep. It provides sufficient heat for your pets so that they can feel the warmth you made for it in a cold environment. Great for reptiles or amphibians: This ceramic heat lamp for reptiles fits for the pet, such as tortoise, snake, chick, lizard, spider, chameleon, turtle, all reptiles & amphibians. For Safety - Please use the ceramic heat emitter with good quality ceramic lamp holders. When using the ceramic heat bulb, keep a distance of more than 30cm from reptiles. Do not turn on the reptile ceramic heat emitter immediately after turning it off, and do not turn the tortoise heat bulb on and off frequently. Service Guarantee - It comes with 2 pack ceramic heat bulbs.