I have a question
- Thread starter Eli_420g
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zem
Well-Known Member
yeah this looks right for a 400w hps. you will need to drill holes one for exhaust and another bigger for passive intake. if you cannot drill, remove the door get some tent fabric or something that you can cut. You absolutely need fresh air supply 24/7. plants need to breathe, also mold will build up, and buds cannot develop with no venting. + it will become an oven in there with ample light for flowering and no venting, no matter what light you use. The exhaust must not dump the air in the same room where you are intake is pulling from from. You could look into LEDs as well, but they are still either expensive or not efficient, so to get a good one will cost a sum add to it that they are a little more challenging to start with. I need the lights' heat most of the time except in mid summer.
thenotsoesoteric
Well-Known Member
If you are looking for just a few ounces a harvest then I would suggest a 250 hid. When I first started growing a decade ago I tried putting a 400w in a small closet and the heat was way to much so I dropped to a 250 hps. I was harvesting 3-4 ounces a month by putting two palnts in flower and then two more a month later.
The 250w will still need venting but not as much as a 400w would. If money isn't an issue I would look into c.o.b. lighting. Cheers and good luck.
The 250w will still need venting but not as much as a 400w would. If money isn't an issue I would look into c.o.b. lighting. Cheers and good luck.
zem
Well-Known Member
yes your way to intake and exhaust can work, provided that the attic has the opening needed to the outside, and that you do it right. small and/or long ducts, curves, and obstructions, diminish airflow significantly. intake passively through holes at least double the exhaust size. With a bit practice, you will get to know the sweet spot where negative pressure is achieved without loss in fan efficiency. the sound of the fan is the first teller, you will notice it having a hard time when you have obstructions vs an easy motion when blowing freely. a 250w works for a smaller area like 2x2.5 max,
Eli_420g
Member
Thanks man, I'll look into it
Eli_420g
Member
First off, nice grow man and how many lumens does your T5 put out all together? Mine is a 4 bulb fixture 216w 20k lumens
r.i.kid
Well-Known Member
8 bulb 400w 40k lum...I have 2 of em...they're cheap 100$ on Amazon
justugh
Well-Known Member
the only thing i was saying is 4 bulbs is crap 20k lumens .....u need 50k for a decent plant
if the plant grows u 1 oz and cost u 200 bucks in feed soil power and seed ....not worth it now if the plant makes u 3-6 oz for the same 200 bucks then it becomes worth it
t5s are not worth it to me as the heat the make builds up as u add more bulbs (just like CFLs) ....t5 are great for starting the plant and veggie but floweing they lack the power to as well as the other lights and to get the power out of them the heat them makes cost u more in AC /fans to controll it
if the plant grows u 1 oz and cost u 200 bucks in feed soil power and seed ....not worth it now if the plant makes u 3-6 oz for the same 200 bucks then it becomes worth it
t5s are not worth it to me as the heat the make builds up as u add more bulbs (just like CFLs) ....t5 are great for starting the plant and veggie but floweing they lack the power to as well as the other lights and to get the power out of them the heat them makes cost u more in AC /fans to controll it
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Eli_420g
Member
I only have one, and no room for more. I think I'll go 250w hps for flowering. Lol
Eli_420g
Member
Yea I understand, I'll just stick with a 250w hps for flowering.