iam running a
'4ft 6bulb T5HO setup' from Hydrofarm and it has been kicking ass (see journals)< but its pretty key that you keep plant number down for them, as their penetration is less than ideal.
now i wont lie, a HID light of just about any sort will work better in the end than any fluoro but like anything, its quite dependent on the grower. I went with T5HO for a few reasons:
1. Heat. It gets quite hot in my area during the summer, and its hard even with the T5's to keep temps under 90 at night. In fact once summer hit, the temperature change between day and night went from about 12-18 degrees to about 5. If i were running an HID my temps at this point would be out of control. That switch wont be feasible til i can afford a better room.
2. Energy. Again, as financial issues have kept me from investing properly just yet in any sort of room or heat control, i also needed something that uses less juice. At 324W and 2.7Amps, this thing barely has an effect on my bill, is low enough amperage to plug into just about ANY cheap timer, and in a few ways less of a fire hazard for my cheap setup.
Now i have been having great results with my setup, but i have no experience with HID's yet. Since i believe its more in the growers hands than the lights (at least to a point), iam sure my yields will go up when i go to HID but i would say this is due to the light itself. More like, with the better penetration and added intensity, i will be able to LST a little less, and fit more plants in (right now i only do 3 plants at a time under them). I think my plan this time is to make the upgrade to the 2700k bulbs for flower, since this run iam using the stock 6700k it came with. Im hoping this will prove some good experimentation, and also delay the hotter light until i hopefully move.
I know long and kinda winded, but I hope it provided ya with somethin.