Well, been a week with the UV bulb (yesterday) not much visible difference. Will be looking at undergrowth, leaf development, structure and color, internode stretch...

The tray with the bottle is the UVB tray. Each tray holds 6 clones. 3 short one's, 3 tall one's each.
The box describes the bulb, and I keep it about 6-8 inches from the clones. Box says one foot for proper usage on reptiles, but no real way to get it further without raising the CFL's.
6 23w CFL's in each chamber, but the addition of the 23w UVB bulb isn't made-up for in the control batch. (no extra lumens for the non-UVB clones) I went back-n-forth with this decision, so I flipped a coin.

I guess I'll have to work on getting better shots for comparison, but like I said...nothing going on yet.

Often wondered what kind of growth I'd get with a 20k MH bulb I have from my days in coral reefing. But it's a 400w and not too sure I would want to commit to the wattage and heat, if results were sub-par...and supplimental lighting would be out of the question. (heat and electric bill)

OldMac: Tell him it's doubtful Home and Garden will be stopping by any time soon. (or keep him out of the growroom, lol)