Zoo Med's Day and Night Reptile Bulb Combo includes one Daylight Blue Bulb and one Nightlight Red Bulb. The Daylight blue bulb gives heat with naturalistic day light while the Nightlight red bulb is a heat lamp for 24 hour heating.Combo bulb pack60 Watt Daylight Blue bulb heats reptile or amphibian terrariumsRed glass heat lamp makes a perfect nighttime bulb for viewing nocturnal behaviorDaylight Blue Bulb- 60 watts- For heating reptile/amphibian terrariums- Long lasting burn life- Uncoated blue glass for optimal heat transferNightlight Red Bulb- 60 watts- Uncoated red glass 24-hour heat lamp- Allows viewing of nocturnal behaviors- Does not disrupt day/night cycle- Long lasting burn life3-month manufacturer warranty.