what up uc? im about to swap my 250w mh in veg with 6 bulb 2ft t5 fixture its an open area main grow area is 3x3 and then the sub area(3x1) is just for mothers you think this would be a good swap? got any good links to go shopping? (4x3area)
actualy its more like a 3x3 area and i was looking at the 8 bulb fixture too. whats the reach with these lights how far away can i go b4 it becomes infective for compact growth?
Well with a 250w HID youd have to keep it about 12" above the tops (at least I do w my
150w HPS, and I couldnt get my 400w within 2ft until I got my cool tube), and using the InverseSquare Law (or the HandyChart Ive attached!) you'll see how the 1ft of heat buffer will leave less than 1ft for the light to travel before it is almost useless. Ive seen that my T5's are pretty effective down to about 18".... with T5's the goal is to keep them as close to the tops as possible since they dont get hot to the touch and your leaves wont get burned if they grow onto a tube or if a leaf settles on a tube. It'll just light bleach the contact point, but it wont stress/burn the whole plant. So with T5's you can (in MY opinion) get as good if not better penetration than HID upto maybe a 600wHID, which is where they really just have so much intensity that they can be effective from a few feet away (again with a few feet buffer between bulb/tops) A cool tube will allow you to get an HID down lower, but an unshielded HID bulb has its drawbacks vs the benefits of T5.
Theres people that keep the T5's at 12" above the tops to let their bulbs blend spectrums better, and they still get good growth from that distance, but closer the better! you'll see the leaves cupping upward just reaching for more of that light they crave! They'll just look happier!
if your fixture is 2'x 12-16", you may struggle to fill out the whole 3x3 area. you may want to get 2 4bulb panels instead so you can put a little space between them to try to <-exxxpaaand-> your footprint. Basically, you dont get any lateral coverage from your panels. Whatever you can fit under the reflectors will be covered well, but expanding that footprint would require raising the fixture, which will decrease your output/penetration/intensity. Gotta keep em low, which limits your overall coverage to the actual dimensions of the panel. You could probably fit 4 plants under two 2'x4bulb panels, but you may struggle to get any more than 2plants under a single 2'x6bulb. It would be good for a 1x3 area tho, for the moms.
so you have an area that is 4' long?
for $100ea, one or two 4' 4bulbs would rock out!
guestimate -MH lumen outputs will be a little less (however they put out proportionally more heat than HPS so the req'd distances may be the same or more)
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