What feature is required by the FDA for sunlamps that radiate UV rays?

The requirement for sunlamps that radiate UV rays to be equipped with timers serves an essential purpose in ensuring user safety. Timers prevent overexposure by allowing users to monitor and limit the duration of their exposure to ultraviolet radiation, which can lead to various skin issues, including sunburn and increased risk of skin cancer. By implementing a timer, manufacturers help to enforce safer usage practices and encourage users to follow recommended exposure times.

While adjustable intensity, materials like glass, or design features such as a clear dome might have their respective benefits, the use of timers is specifically emphasized by the FDA for its direct role in regulating and reducing the risk of harmful UV exposure to the skin.