Ive used this for years to start my babies out until they were big enough for a closet. I used a 3 ft long and 4 foot tall Rubbermaid container and lined it with foil. I have one 2 1/2 foot flourescent lamp maed by GE. Its just a standard light. And a small fan. I have drill 10 1/2 in. holes in the top to get rid of excess heat only and i have a temperature gauge that can be veiwed from the outside. and another thermometer temp. gauge on the inside. I can get about 6-8 plants in there. I jst woke up one day and made it. I also did that with my Pringles can bong. LOL. hell...its a two footer. i duct taped two green cans together and cuts some metal tubing for the chamber and a bowl head. its a really good bubbler. Just wanted to share. Later