Color light therapy. You basically take a small stage spot, mount it on a tripod and then use specific true color gels and shine the light on parts of your body. Yo can read a primer on this in "Healing for the Age of Enlightenment" by Stanley Burroughs (Master Cleanse fame). Wiki sure does the usual character assassination on Stan. That site has become a global elite propaganda vehicle.
I went through some amazing spiritual experiences when I was doing that some years ago.