Providing appropriate UV-B lighting is a fundamental welfare requirement for most captive reptiles, yet remains one of the most commonly inadequate aspects of reptile husbandry in home collections.
UV-B welfare in reptile keeping is a concrete, actionable issue with clear welfare consequences when inadequate. Metabolic bone disease progresses from subtle calcium absorption problems to skeletal deformities, pathological fractures, and neurological signs - all of which involve significant pain and functional impairment. The condition is entirely preventable with appropriate lighting and nutrition but requires keeper education and willingness to invest in quality equipment. Welfare-conscious reptile keeping also requires regular lamp replacement schedules even when lamps appear to function, since UV-B output degrades before visible light output.