Deliver UVA and UVB rays to your sun-loving bird pet with this energy-efficient full spectrum bulb. UVB allows birds to synthesize vitamin D3 in their skin for proper calcium absorption and for normal growth and egg development. UVA helps birds curb feather picking and other destructive behaviors. Without UVA birds are colorblind, making mate recognition, species identification and locating food extremely difficult. Designed for use with the Avian Sun Deluxe Floor Lamp.