A reptile can't tell day from night through a lit red bulb the way it can through white light, which is exactly why a red-glass heat lamp can run through the night without disrupting its normal activity.

This is a red glass bulb with a built-in reflector, emitting infrared-A (NIR) heat radiation that penetrates the skin and provides heat for activity and digestion. It's a pet-care bulb for reptiles, amphibians and invertebrates only, and it can be combined with a daytime heat or light bulb for a full 24-hour cycle.

• Red glass bulb with a built-in reflector to direct the heat
• Emits infrared-A (NIR) heat radiation that penetrates the skin
• Provides heat for activity and digestion, day or night
• Red light does not disrupt the animal's normal activity cycle
• Pairs with a daytime heat or light bulb for a full 24-hour cycle
• A pet-care bulb: for reptiles, amphibians and invertebrates only

On wattage. This bulb is sold in more than one wattage, and Exo Terra don't publish a temperature guarantee for any of them - the right one depends on your enclosure's size and how far the bulb sits from the basking spot, so check the temperature at basking height with a thermometer once it's fitted rather than assuming the wattage alone will hit the right number.

Who it's for: reptile, amphibian or invertebrate keepers who want a heat source that can run overnight without the light itself disturbing the animal's normal cycle.