Want to harvest a large amount of marijuana in a small space using minimal electricity? Try an octagon set-up. First, build or buy eight shelving units that will fit in your desired growing space. I built my shelving units with 5 shelves which hold two three gallon pots each. My unit holds 80 plants in a 10' x 10' area! Make sure you build the shelves wide enough to spot a tray underneath the two pots. Painting the shelves white with mold resistant paint is also key. Place the shelving units in octagon formation and hang a chain in the center of the octagon. To the chain, attach your lights. The larger the octagon unit and the larger the grow space you have, the more electricity you can run. Just make sure you have adequate ventilation, with intake blowing straight up the chain. If your lights are cool enough, you can squeeze the shelving units as close to the light source as possible. Be careful to check for burnage, if you see any signs, pull back shelves accordingly. Placing wheels on the bottom of shelving units is a convenient way to adjust them. The use of a watering wand is also key with this set-up due to the tight squeeze between the top of pots and the shelf above. One last tip, use a netted trellis to hold back the huge buds, or place eye hooks on the sides of each shelf and tie some hemp twine from eye hook to eye hook. My unit uses only 2600 watts and produces a good 3.5 pounds each harvest. Good luck!