Many reptile species require UV-B light for vitamin D3 synthesis and calcium metabolism. Without appropriate UV-B provision, reptiles develop metabolic bone disease - a painful, preventable welfare problem.
Metabolic bone disease in companion reptiles is one of the most common and most preventable welfare problems in herpetoculture. Affected animals develop painful skeletal deformities, fractures from minimal trauma, and in severe cases neurological signs - all from what is essentially a lighting and nutrition failure. The insidious aspect of UV-B deficiency is that lamps continue to appear functional while their UV-B output declines to ineffective levels, and early vitamin D deficiency causes no obvious signs before bone disease develops. Welfare-conscious reptile keeping treats UV-B provision as a non-negotiable element of basic care, uses appropriate specialist lamps, replaces them on schedule, and verifies output with measurement tools. Prevention is entirely achievable with appropriate knowledge.