As some of you may know I'm working on my closed chamber. What is the distance that should be between the bulb and the Tort? I have a 100W Zoomed Powersun and a 100W CHE.
Let your thermometer be your guide. You want a 100 degree basking spot. Adjust the height to get that.
MVBs are usually much too hot and high wattage to use in a closed chamber. Unless your chamber is room size and in a cool basement or something. You will probably need a lower wattage flood bulb and a tube style florescent for UV when you can't get sunshine. My closed chambers are 4x8x2' and I can only use 65 watt flood bulbs, at the most.