I wanted to provide an update since I read an article about light boxes for depression. This includes blue light. It's ok if you don't use the light more than 5 minutes per day. Over time, it may eventually lead to macular degeneration in eyes if you use it 30 minutes or more per day. I guess you could protect your eyes with sunglasses or those black sunglasses they give you after having your pupils dilated during an eye exam. However, I saw a blue light device meant to be used for 3 minutes per area on the face. So, it could just be used for 3 minutes on the lip area (or 3 minutes on top lip and 3 minutes on bottom lip which is close to 5 minutes) to avoid this potential pitfall. Or wear protective sunglasses if you use it beyond 5 minutes.