How much more would say 8 compact floros total of 350-400 watts, small fan, and a small heater with a thromostat raise the electricity bill, 30 bucks?
with the ballasts and bulbs, in a tiny chamber( like 4ft high, and 15'sq, you won't need the heater. Even the latest CPs have to be within 4 inches of the foliage, and have to to be placed among, even beneath the plants.Cover every surface with reflective material, angling corners, and covering the soil. But you will have to increase the number of lights unless you control the height by pruning or pinching, etc. Good luck! The earth girl has been there and done that. What it will do to your bill should not really be a flag raiser, unless you are on the welfare system, or other wise under big brothers jurisdiction. Do what you can to keep waste in the home to a minimum, and it will hardly be noticable.