Red light therapy has been used for decades for anti-aging purposes but has recently become popular in the medical field for many other uses. Red light is beneficial to the skin and also attacks viruses, bacteria, and cancer cells. The 5 different categories of red light therapy devices are home-use devices, commercial devices, handheld devices, wearable devices, and beds. Each type of device is unique and carries its pros and cons based on the different ways it can be used. https://redlighttherapysblog.tumblr.com/post/681237544803926016/there-is-no-one-perfect-red-light-therapy-device