LightStim for Pain LED light therapy that is FDA cleared to temporarily relieve arthritic pain, a variety of minor aches and pains, relax muscles and increase local blood circulation. It’s warm soothing light is recommended for post-workout soreness, accidents, and sports injuries, backaches, arthritis, and stiffness. LightStim for Pain has been clinically proven to be safe and effective and is a natural way to ease the pain while aiding in your body’s recovery process.