1000W Tent Setup - Help?

Hello,

Thanks to feedback from my last posting... I've decided to take the plung for 1000W HPS air cooled light in my 4.67' x 4.67' x 6.5' grow tent. I will be using 12 Hydroponic bubbler units with either 2-3 plants per unit.

I need feedback from you growers to get everything just right...

1) How many plants per sq foot? I will be growing smaller plants with short veg time, similar to SOG.

2) Ventilation - I need to pickout the right air cooled fixture. I have two carbon scrubbers (1 15lb and 1 7lb) and need to pick out a 6" inline fan. HTGSupply has a 424 cfm, will this be enough? My tent CFM is 142. And how loud are these (~50dB, how loud is that?!)

I need to run scrubber(s) -> fan -> light - > outake (15' to exit point).

3) Cooled Light fixture - I need to pick one out. I'll likely buy one from HTGSupply. Is the Euro style the norm? How about the Cool tube? Are any of these better than others for large coverage?

4) Co2 - I will be at nearly 6,900 lumens / sq ft or 46 watts / sq ft. I've heard that you only see a 10-15% yield increase with Co2 and with proper ventilation it's not worth it, any thoughts on this?

And if Co2 is worth while, how should that change my ventilation? Would it then be best to run seperate ventilation from outside the tent to the cooled light only, in order to keep CO2 in the room while still removing heat? If so, what's the best way to vent?

Thank you!!!
I appreciate everyones help. After researching this stuff, having second opinions to bounce this stuff off of helps out a lot!

It is going to be terribly difficult for you to properly ventilate that area, and you can pretty much take CO2 out of the equation unless you don't mind wasting most of it.

Temps may be very high as well unless you run an air conditioner. 1000W bulbs get pretty hot, especially in a confined space like that. No reason it wont work (without CO2 of course) if you have a good source of cool air. Perhaps a portable air conditioner to duct cool air into the tent and have the exhaust run out (may result in a light leak, so be mindful of keeping plenty of curves in your exhaust ducting (unless you run your carbon filter on the outside of the tent)).

GrowTech said:

It is going to be terribly difficult for you to properly ventilate that area

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I can do without Co2, however I can only do so much as far as ventilation goes...

Like I said I am able to use an air cooled fixture 12/12 at night time with a 424CFM inline fan exhausted outside my house without a problem. The grow tent will be in an air conditioned room and I was planning on running a 6" intake piece 10' away from the tent along the floor near an A/C register... but thats all I'm really able to do. I can ensure that the room that the tent sits in never goes over 76F... but those are my limits.

As far as CO2 went, I assumed that I would be able to some how run two seperate ventilation ducting; one scrubbing the room when the CO2 was off and another pulling air through the lamp 100% of the time.

If youre going to run co2, you need to change your air intake for the light. You need an intake from a wall, window, anyplace outside the room through some ducting through the 1000w and out of the area. This way you dont vent the co2.

If you run co2, temps in the 80's are fine. The 400cfm will work well to cool the bulb.

Just pick up another 6" fan for the scrubber, and let it recirc in the room.

With AC in the room, you should have few high temp problems.

Good luck

-Skibaba

Skibaba said:

You need an intake from outside the room through some ducting through the 1000w and out of the area. This way you dont vent the co2.

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If I do this though... wouldn't the light exhaust not be scrubbed? I cannot have dirty air venting outside?

jjng5 said:

If I do this though... wouldn't the light exhaust not be scrubbed? I cannot have dirty air venting outside?

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Shouldn't be an issue if your hoods are sealed.

shipinit said:

Shouldn't be an issue if your hoods are sealed.

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I understand, however is co2 worth the added expense and hassle? Again my setup will be 6,800 lumen/sq ft or 46watt/sq ft. At this light intensity, would I notice a significant increase to warrant it? I've heard from others that they merely gained 10-15% in yield (which to me, wouldn't be worth it.)

Any thoughts? Thank you again!

Heres my setup idea of how you should do it to get the best result in keeping it cool.

(In Image)

No need for subber on exhaust out of house because its only dealing with the air from the cool tube and will exhaust hot air outside your house.

Bigger subber on exhausting the tent, you could also vent it into the subber and outside with the light exhaust to get rid of ALL the hot air.

Intake has a subber because theres no fan and you don't need any slipping smell going into the house.

Also with the CFM of fans you should use, I'm not sure, just trying with fans, if its too hot, return and buy more powerful fans.

If you need anymore details just pm me.




Second option is listening to Skibaba, same idea as mine, but don't have an intake or outtake of the tent itself and run it with CO2 with higher temps.

That is a good idea above,however vertical use of tent space would yield best i believe.
Build a version of the cage with 3 or 4" pvc wyes in your tent to specs you like.
I threw 8 x 4ft plants in 18 gal bins with ff soil and put them diamond formation arround a 1k hps with no hood hung vertically,4" in and 4" out youll be fine,but the hood is a a/c hood is great,maybe do that with simple diy buble bucket system 16 buckets=Dwc monsters!

velaur said:

No need for subber on exhaust out of house because its only dealing with the air from the cool tube and will exhaust hot air outside your house.

Bigger subber on exhausting the tent, you could also vent it into the subber and outside with the light exhaust to get rid of ALL the hot air.

Intake has a subber because theres no fan and you don't need any slipping smell going into the house.

Second option is listening to Skibaba, same idea as mine, but don't have an intake or outtake of the tent itself and run it with CO2 with higher temps.

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I'm sorry, I am a bit confused by your idea. Let me see if i understand correctly...

You are saying there is no need to scrub the air that only blows from outside the grow tent through the 1000W lights and back out, but I'm not sure what you mean by...

Bigger subber on exhausting the tent

Click to expand...

and I also don't understand,

Intake has a subber because theres no fan and you don't need any slipping smell going into the house.

Click to expand...

Are you saying to put a scrubber outside of my house?

Thanks for taking the time and making a diagram, I really want to understand your suggestion because I'm having a difficult time coming up with the right combination for the maximum results at the highest efficency (cost wise).

Thanks again!

jjng5 said:

I'm sorry, I am a bit confused by your idea. Let me see if i understand correctly...

You are saying there is no need to scrub the air that only blows from outside the grow tent through the 1000W lights and back out, but I'm not sure what you mean by...

and I also don't understand,

Are you saying to put a scrubber outside of my house?

Thanks for taking the time and making a diagram, I really want to understand your suggestion because I'm having a difficult time coming up with the right combination for the maximum results at the highest efficency (cost wise).

Thanks again!

Click to expand...

If you have air coming from your bed room onto the light and back out your bed room and theirs not need for a subber, since its exhuast from your light, and not exhaust out the text itself.

If you still don't understand that idea, I don't know how to explain it better then that, ask someone else to read my posts and ask them to explain it to yourself.

For the second question: You want a subber on the tent's intake (not talking about the light's intake) just in case the smell leaks outs the intake vent.

Like I've said before, if you can't understand it ask someone to explain it to you.

Good luck man!

Let me ask you this... if I decide to scrap the co2 idea could I use just one 424cfm inline fan to suck air from two scrubbers (7lb + 15lb), push air through my air cooled 1000W light, out of the tent and about 10-12ft outside? Then provide a second (no fan) intake line from another room? Would this be enough provided that I keep the environment a/c around 76 degrees F?

Thank you!

jjng5 said:

Let me ask you this... if I decide to scrap the co2 idea could I use just one 424cfm inline fan to suck air from two scrubbers (7lb + 15lb), push air through my air cooled 1000W light, out of the tent and about 10-12ft outside? Then provide a second (no fan) intake line from another room? Would this be enough provided that I keep the environment a/c around 76 degrees F?

Thank you!

Click to expand...

You are asking a lot of that fan.....at least I think so. I was doing something similar in my tent and decided to run two fans, one for the carbon scrubber and one for the hoods. Main reason is I will be able to control the CO2 better and I wasn't getting real great flow through the scrubber and little negative pressure. Also remember the loss of efficiency you will have for every foot of ducting you are running.