UVB has a direct effect upon the immune system in skin and also stimulates production of beta endorphins, giving sunlight its feel-good factor. This range of the light spectrum is crucial for its role in skin synthesis of vitamin D3. For this to occur, sunlight must contain UVB in a particular range. Most glass and plastics block these wavelengths. The use of the incorrect % or incorrect placement will also affect how much UVB your animal is receiving. Vitamin D3 synthesis in reptiles requires warmth as well as ultraviolet light.

UVA, is essential. Reptiles have extremely good color vision, they have a fourth cone which response to UVA. UVA light helps regulate behaviors such as feeding (appetite), diurnal movement, mating and similar activities.

Reptiles bask to heat their skin in order to capture D3, increase their metabolism, drive their natural rhythm and behavior, manage fungal and bacterial infections, manage viral infections, heal wounds, digest foods, for shedding and parasite management. For these purposes they require IR heat, A, B and C. IR-A is deep tissue penetration. IR-B is moderate penetration and IR-C is superficial penetration. Reptiles require deep tissue penetration. These heat bulbs also have a small amount of UVA. They provide a full spectrum of visible light to fill in the gaps from the uvb/uva bulb