here are some simple guidelines: FOR SKIN ISSUES: Assuming you have one of the lights I recommend, for skin issues (e.g. anti-aging benefits) and other more superficial (near to the surface) body issues, here are my basic usage suggestions: Somewhere between 1-4 minutes from 12” away. (Note: For skin issues, I recommend going 12” or more away from the device, whereas with deeper tissues, you want to be closer and have higher power density to reach deeper into the tissues.) Or 1.5-5 minutes from 18” away. Or 2-8 minutes from 24” away.
