Red Light Logic Guide
Red Light Therapy and Muscle Stiffness
How to think about red light devices when stiffness is the reason you are researching them.
Muscle stiffness can have many causes. A light device is a product choice, not a diagnosis.
Start with the cause when it is unclear
Persistent, severe, or unexplained stiffness deserves appropriate medical attention.
For device research
Compare fit, coverage, session setup, instructions, and the evidence relevant to the outcome you care about.