Ring lights are circular LED lights often used for selfies and video calls, providing bright and even illumination. They can also serve as sunlight simulators for individuals who lack access to natural light, especially during the early morning hours.
Things like ring lights that are sold in order for people to takeselfies and this kind of thing.
""Huberman suggests using ring lights as a cheaper alternative to sunlight simulators, particularly for those who wake up before sunrise or live in areas with limited sunlight."