Providing the correct levels of UVB allows your bird to synthesise vitamin D3 in their skin, or through a special process involving the preening gland. Vitamin D3 is essential for proper calcium metabolism. This is necessary for normal growth, maintenance of strong bones and egg production.
Birds have specialised retinas that enable them to see UVA, helping them to recognise mates, locate food, and identify different species. Without UVA, birds are deprived of the full colour spectrum they see in nature and are colour blind. Unlock their world and let a bird see it in full colour!
UVA is essential for the psychological health of a bird. Using lighting that emits UVA can also help to curb feather picking and other destructive behaviours.