 If you notice maybe you're a little more lethargic throughout the day and you just don't feel like you have the same amount of energy, that red light or just light exposure will help with making you less tired throughout the day and less lethargic. Maybe you are, like I said before, dealing with acne. You want that green light, that yellow light, that blue light. That's what's going to help it. It's kind of based on you want to do your own due diligence with it. I can't prescribe it over the phone for who needs what, but