There are two general types of medical lasers, surgical and therapy. Surgical lasers are hot lasers and low power lasers are called cold lasers However, now that there has been a lot of innovation, there are also powerful, cool lasers that we can call "warm" lasers because the beam is diffuse but very powerful and produces some warmth during treatment. Research shows that more powerful light produces more significant benefits than less powerful devices. Although both treatments improved the pain levels, function, and quality of life in patients, more power is better. Lasers Med Sci 2018 Aug;33(6):1363-1369