RRC,

The key issue with laser or LED near infrared therapy is wavelength. 800 to 1000 nm wavelength is suggested as best.

I have a ReVive system that cost about $80. I used it for weeks on a shoulder to help with recovery from surgery. Unfortunately, it caused such an increase in inflammation that I had to stop using it. I only used it for 15 minutes 2 or 3 times a day.

Some will try to say low level laser (gas laser) is better than LED/laser diode near-infrared but both are the same if they put out the same wavelength. It is a matter of the physics of light. The research shows no difference.

Different wavelengths provide different benefits so be sure to get a deep tissue wavelength. 390 to 600 nm for skin repair and 800 to 940 nm for deep tissue. By deep tissue, the maximum depth is only 4 mm or 0.4 cm Some claim a penetration depth of 40 mm but the US NIH research says 4 mm is the deepest penetration.