The flower chamber has 2x 150w HPS bulbs in home-made air cooled reflectors. In the summer, I can put glass into the fixtures to act as a heat shield. To add a little spectrum variety and a few extra lumens I added a few CFLs in as well. Circulation is from a small hanging desk fan. Everything suspends from the ceiling and is easily adjustable. Air flows from the veg into the flower chamber, and finally into the utility chamber via a bathroom fan with speed control. Inside the utility chamber, I have a small ozone generator for odor. For ultimate odor control however, the vented air gets blown into my house's plumbing vent stack - blowing split out the roof and into the sewer. What better place to hide odor than in a big shit pipe??
As I said, each plant spends 10 days in each of 6 positions, for a total of 60 days in 12:12. I also try to rotate each plant 90 degrees every day (poor man's light mover). In each position, I do something different each cycle. Examples - Position 1 gets continued training as it stretches, 2 & 4 get a dose of nutes, when a plant gets to position 3 and 5 it gets a decent h2o flush . At 5 and 6 I trim out large fan leaves to get more light to the lower regions. (the plant would be starting to drop them anyway). 5 & 6 also get Molasses or sucanat.
Hanging over the last 2 positions, I have a UV-A Cfl, sold in pet stores for people keeping reptiles. There is an interesting video online I saw regarding UV-A and THC production (google it). What sold me was a map overlay naturally occurring high-THC strain lo-cals, with UV-A concentration. Highest UVA levels i.e., equatorial and high mountain regions historically produced the strongest weed. Anecdotally, I felt it made the plants finish sooner and more potent. HPS bulbs don't put out squat UVA.
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