The following link takes you to a site with free plans for a great little greenhouse that you can build yourself out of easy to find inexpensive materials. HERE for greenhouse plans. The yeast in the beer is the active ingredient. When using organics it is very important that you provide good aeration of the nutrient solution. Aeration is important in any nutrient solution, but lack of it in an organic solution can mean a stinky, stagnant mess.
Flourescent bulbs are the worst as they lose almost all their energy within a few inches.
This height will vary depending on the size of the HID light. Put the fertilizer into the panty hose and tie it shut. Hang the tea bag in the reservoir and suspend it directly over the air stone. Aeration of the reservoir is very important, especially when you are using organic nutrients. Apparently its the calcium in the milk that does the trick.