Final answer:
The purpose of a sun lamp timer according to the FDA is to help people maintain a regular circadian cycle by providing exposure to bright light. This can be beneficial for individuals working night shifts or those affected by seasonal variations in light. The timer allows for controlled and timed exposure to the sun lamp, ensuring that it is used in a safe and effective manner.
Step-by-step explanation:
According to the FDA, the purpose of a sun lamp timer is to control exposure time to artificial sunlight to prevent overexposure, which can lead to skin damage or other health issues associated with ultraviolet (UV) light. These devices are particularly useful for individuals trying to maintain a regular circadian rhythm, especially if they work night shifts or are affected by seasonal changes in natural light availability. By using a timer, the sun lamp can provide the benefits of light therapy while minimizing risks.