Most reptiles benefit from infrared light to help them thermoregulate. Infrared light (IR-A, IR-B, IR-C) penetrates deep, warming their entire bodies. Reptiles benefit from a combination of IR-A, IR-B, and IR-C. The sun, or your basking spot bulb, produces the needed IR-A/B. IR-C is produced from stored heat on surfaces such as rocks, which is the reason many reptiles bask on rocks in the wild. Our Zen Cave includes a slate stone basking spot, which provides the IR-C your reptile needs.