Good question, Tonita. I am learning by the seat of my pants as well. Depends on who you read...Mercola and Wilson (www.drlwilson.com) reccomend lights...like the ones overhead in your bathroom...the infrared spectrum because it is the light that inhibits the sympathetic nervous system, thus increasing immunity as well as being very soothing to the emotional body and chakras. Wilson has plans for his sauna on his webpage and you can make it in a bathroom or closet...and will cost about 50 bucks and an hour of time. McGee (www.cheeenergy) reccomends far infrared as the best source and says you can also make it in a small bathroom using an overhead infrared heater from www.grainger.com for a hundred bucks. I think we need to put these 2 guys in a room to duke it out. Personally, I am constructing the 3 red lights (ala Wilson) with the infrared heater from grainger...Ill let ya know (-: