Too Much Light? 6000w in 8x22

[chameleonsc]

Would 6000w in a 8x22' room be too much light? Seems like if I had enough air going over the hoods it would be fine.

With 90 degree bends at each end of a 6 hood run, what would be the optimal fan setup?

Cheers!

 

[bayarea925]

a big one to keep it cool. at least 500 cfm but more like 800

 

[FreezerBoy]

176 sf x 50 watts per is 8800 watts. You're under lit.

Ventilation 101

Understanding Air Flow

 

[Space Toker]

I'm no expert, kind of wondering myself, but I know in the old days people said 20-40 W/SQ FT (WSF)was plenty, now everyone is using crazy power on their buds but some of us can't use that much electricity! It seems to me, from what I've seen, that people using low wattages (say a single or double 400) tend to go with crazy WSF, like 50 or 60 or even 100+! When using a single 1000, it seems people do about 40 WSF, and with multiple lamps it seems they go way down to 20-30 WSF, maybe due to overlapping light footprints, heat and electric use concerns, I don't know. Again I am curious on nailing this down too.

fwiw, over a decade ago I grew some fine looking bud even under 20 WSF of flo light and later a MH (seemed hardly better than the flo!). So it can be done if you don't have to have a bud you can drive a nail with!

 

[FreezerBoy]

You can certainly grow with less but, as one who recently went from 33 to 56 wsf, the difference is staggering.

 

[Toomp]

I'm no expert, kind of wondering myself, but I know in the old days people said 20-40 W/SQ FT (WSF)was plenty, now everyone is using crazy power on their buds but some of us can't use that much electricity! It seems to me, from what I've seen, that people using low wattages (say a single or double 400) tend to go with crazy WSF, like 50 or 60 or even 100+! When using a single 1000, it seems people do about 40 WSF, and with multiple lamps it seems they go way down to 20-30 WSF, maybe due to overlapping light footprints, heat and electric use concerns, I don't know. Again I am curious on nailing this down too.

fwiw, over a decade ago I grew some fine looking bud even under 20 WSF of flo light and later a MH (seemed hardly better than the flo!). So it can be done if you don't have to have a bud you can drive a nail with!

i think bout 150 watt per sq ft on eath little more little less

 

[chameleonsc]

So as far as fan placement....I was thinking a 10" Max Can on end end of the 6 lights, with another at the other end. Both would have 90 degree bends in the ducting before them, so there would be a decent amount of restriction.

But, I figure with 1000cfm (unrestricted, so probably 800 or so) should still be able to put ample enough air over the hoods. Right?

 

[Space Toker]

i think bout 150 watt per sq ft on eath little more little less

I think it was 100, yeah heard that each Sq ft on Earth gets that much too, but prob in the middle of a lava field in the bright glaring sun in the tropics. Even if 150, most of the time Nature delivers less than ideal conditions and the real intensity is far less. Also, most of that is wasted, as the Sun gives off all kinds of wavelengths of light not useful to plants. But because it gives off so much light, plants still get plenty of what they need, and it still comes out to more than indoor lights. But indoor lights don't deliver all of their light in a useable spectrum either, but the percentage is prob higher. The point is, I don't think anyone needs anywhere near 70-100 WSF inside, I think 50 is plenty. Granted it was without CO2 enrichment, but I did 50 WSF under a 400 once and the results weren't much better than my 20 WSF grows.

If you did have better results, in what way was the difference staggering Freezerboy? Yield? Density? By what percentage was the yields better? In other words, is it cost effective for those who are concerned with that or just for those that are after the best bud possible at any cost? In other words, those using many or multiple lights are prob more concerned with lighting as large an area as possible with the lights and get as much total as they can if you know what I mean.

 

[bordercollie]

i run 6 1000 hps all close loop connected, with n 8 inch inline on each end, over 13x11ft room, 30 babies in 5g buckets... cool as a cucumber. im going to add double that in the next run. i get 7-10lbs. but my buddy has 12 1000 and he gets 17lbs from the same set up

 

[djstiks]

i run 6 1000 hps all close loop connected, with n 8 inch inline on each end, over 13x11ft room, 30 babies in 5g buckets... cool as a cucumber. im going to add double that in the next run. i get 7-10lbs. but my buddy has 12 1000 and he gets 17lbs from the same set up

very nice

 

[PuReKnOwLeDgE]

Good job freezerboy I had the results off the calculator before I read your post

 

[Space Toker]

I guess I should take this opportunity to ask you since you brought it up, what is this about connecting lamps or any other wiring other than outlets? The lamps I have can just be plugged into regular sockets or outlets or whatever, so what is the purpose of this "close loop connected" you speak of? Does that have some advantage when you are running more than a couple lamps as you are? And dude, is all that light really necessary? IF you were using say 4000 in that area, would the results be 1/3 (or more) less impressive? I guess I am just looking for some hard numbers for comparision.

ps/edit: those are nice results though bordercollie! Who can argue with that? To be perfectly clear, my intent is not to argue but to learn what is necessary and what is luxury, and compare results of those that use x WSF versus those that use 2x WSF and see if the results are really 2 or more times better or if it is just overkill in the pursuit of perfection. For instance, would your buddy (or you) not get better yield if he doubled the size of the room along with doubling the wattage, or not?

 

[250wscrogger]

I'd say run atleast 50 watts per square foot if you want nice buds. The only way to effectively cover more space than 20sqft per 1k lamp is to use light movers. Aircool those lights in 2 rows of 3 1k's in a 10x12 room (96 plants @ 1 per sq ft SOG, 2 4x12 rows) if you want 2ft of walking room between rows. You could always go 10x15 and do 20 plants per 1k if you don't mind the numbers. If you want to use light movers... forget about the air cooling, go 4x8 per 1k and get a 3 ton a/c unit to keep the room cool. You should have no problems hitting atleast 1.5 a light (2 per when dialed in) with a stationary 1000 over 16 plants if you're a decent grower. I've seen close to 2.5lbs with a 1k on a mover over 32 plants.

 

[cyberwax]

http://www.briteideashydro.com/bicalc.swf

Using a 50w optimum.