What aspect of sunlamps is closely monitored by the FDA?

The correct response highlights the importance of automatic shut-off timers in sunlamps, which are closely monitored by the FDA to ensure user safety and reduce the risk of overexposure to ultraviolet (UV) radiation. These timers are crucial in preventing users from staying in the sunlamp for too long, thereby minimizing the likelihood of skin damage or other harmful effects associated with excessive UV radiation exposure.

Automatic shut-off timers serve as an important safety feature, allowing the device to turn off after a predetermined duration of use, which helps protect users from unintentional overexposure. Such precautions are vital in regulating the use of sunlamps, as the cumulative effects of UV exposure can lead to serious health concerns, including skin cancer.

While aspects like radiation intensity or duration of use might also be relevant in the context of safety, the specific focus on automatic shut-off timers indicates a proactive measure intended to foster safe practices among users. This regulatory attention underscores the FDA's commitment to minimizing health risks associated with the use of tanning systems.