The Exo Terra Sun-Glo Intense Infrared Basking Reptile Spot Lamp - 120V ranges from 50 to 150 Watts with a high output for lall sized enclosures. It increases light and heat in the beam by 35%, allowing you to position the lamp farther and still create a hot basking zone. This 100W bulb raises ambient temperature significantly and emits beneficial UVA, making it ideal for various sized terrariums that house sun-loving reptiles requiring intense basking conditions. Available in Multiple Wattage options