You may observe the abbreviation "nm" over the outer packaging for red light therapy equipment, and Dr. Jody A. Levine, a board-Accredited dermatologist in New York, says this is a vital metric. It stands for nanometers https://zakariaqnsf872561.imblogs.net/80199860/helping-the-others-realize-the-advantages-of-medical-grade-red-light-therapy-devices