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Offlinepftek
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Registered: 09/18/09
Posts: 137
Last seen: 6 years, 10 months
how much fan power do I need? for 600 watt HPS?
    #330725 - 12/13/09 04:21 PM (6 years, 11 months ago)

looking to go cheap. suck out smell and heat.


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Offline81renaissance
Coachella '13 KKOTY
Male


Registered: 04/20/08
Posts: 4,181
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Last seen: 4 months, 27 days
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330726 - 12/13/09 04:23 PM (6 years, 11 months ago)

NEI

Cubic feet of growspace?
Ambient temps?
Do you have a carbon filter?


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


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Offlinepftek
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Registered: 09/18/09
Posts: 137
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Re: how much fan power do I need? for 600 watt HPS? [Re: 81renaissance]
    #330728 - 12/13/09 04:27 PM (6 years, 11 months ago)

Quote:

81renaissance said:
NEI

Cubic feet of growspace?
Ambient temps?
Do you have a carbon filter?




6x4 feet. not sure how high yet. maybe 7 feet.

60-70 degrees. i can turn off the heater. and get it to 60.

not yet but will make a diy one.


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Offline81renaissance
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330732 - 12/13/09 04:30 PM (6 years, 11 months ago)

Ok so 6x4x7=168 cubic feet, so I'd recommend a fan with at least 376 cfm so that you can exchange air at a rate of twice per minute.
If your ambient temp is in the 60-70 range, that amount of air exchange should control the temps in your room.  Make sure you have an oscillating fan to move the air around as well.


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


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Invisiblecoda


Registered: 04/20/08
Posts: 4,734
Trusted Cultivator
Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330733 - 12/13/09 04:31 PM (6 years, 11 months ago)

temps should be in the 76-78 degree range for optimal growth

6x7x7 = 294 CF

So at minimum you would need a 300 cfm fan to change the air once a minute in your cab.


--------------------


MFDoom666: sobriety kills my buzz every time.


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Offline81renaissance
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Re: how much fan power do I need? for 600 watt HPS? [Re: coda]
    #330736 - 12/13/09 04:37 PM (6 years, 11 months ago)

Quote:

6x4 feet. not sure how high yet. maybe 7 feet.




So this is the 168 CF I got.  Just a minor change.

PF: Are you using HID lighting?


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


Post Extras: Print Post  Remind Me! Notify Moderator
Offlinepftek
Stranger


Registered: 09/18/09
Posts: 137
Last seen: 6 years, 10 months
Re: how much fan power do I need? for 600 watt HPS? [Re: 81renaissance]
    #330743 - 12/13/09 04:50 PM (6 years, 11 months ago)

Quote:

81renaissance said:
Quote:

6x4 feet. not sure how high yet. maybe 7 feet.




So this is the 168 CF I got.  Just a minor change.

PF: Are you using HID lighting?




yeah i'm thinking of getting a 600 watt HID system MH/HPS. most likely something like this:

http://cgi.ebay.com/600-WATT-HPS-DIGITAL-GROW-LIGHT-w-XL-HOOD-600w-BALLAST_W0QQitemZ180443381037QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2a03437d2d


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Offline81renaissance
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330747 - 12/13/09 04:56 PM (6 years, 11 months ago)

Okay, but in a 6x4 room, you'll need two of those setups if you want to get 50 watts/ft^2.  You're only providing half of that...not enough even to cover the growing area.


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


Post Extras: Print Post  Remind Me! Notify Moderator
Offlinepftek
Stranger


Registered: 09/18/09
Posts: 137
Last seen: 6 years, 10 months
Re: how much fan power do I need? for 600 watt HPS? [Re: 81renaissance]
    #330751 - 12/13/09 05:00 PM (6 years, 11 months ago)

it's only 9 plants...

i'm building 3 of these: 

http://www.stealthhydroponics.com/product.php?xProd=16&xSec=60

still not enough?


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Offline81renaissance
Coachella '13 KKOTY
Male


Registered: 04/20/08
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Last seen: 4 months, 27 days
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330755 - 12/13/09 05:08 PM (6 years, 11 months ago)

:shrug: I know nothing about hydro, but as far as lighting is concerned, I know the rule of thumb is 50 watts/ft^2 and I never go below that.
Those tubs hold 6 plants each, so if you have three, that's 18 plants...are you modifying the design?


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


Post Extras: Print Post  Remind Me! Notify Moderator
Offlinepftek
Stranger


Registered: 09/18/09
Posts: 137
Last seen: 6 years, 10 months
Re: how much fan power do I need? for 600 watt HPS? [Re: 81renaissance]
    #330764 - 12/13/09 05:19 PM (6 years, 11 months ago)

Quote:

81renaissance said:
:shrug: I know nothing about hydro, but as far as lighting is concerned, I know the rule of thumb is 50 watts/ft^2 and I never go below that.
Those tubs hold 6 plants each, so if you have three, that's 18 plants...are you modifying the design?




i'm using seeds. i'm just assuming half of them are going to be male and i'll have to rip them out.


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Offline81renaissance
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Registered: 04/20/08
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330769 - 12/13/09 05:23 PM (6 years, 11 months ago)

Don't assume.

Here's the long and short of it: 600 watts is adequate for 12 ft^2 maybe up to 16 if you want to push your luck.
Beyond that you'll see airy buds, and low yields, basically low quality herb.
If you can only get 1 600 watt setup, I recommend utilizing less space than 6x4.
This is only one grower's opinion, and in the end, they're your plants to grow as you please.


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


Post Extras: Print Post  Remind Me! Notify Moderator
Offlinepftek
Stranger


Registered: 09/18/09
Posts: 137
Last seen: 6 years, 10 months
Re: how much fan power do I need? for 600 watt HPS? [Re: 81renaissance]
    #330783 - 12/13/09 05:49 PM (6 years, 11 months ago)

Quote:

81renaissance said:
Don't assume.

Here's the long and short of it: 600 watts is adequate for 12 ft^2 maybe up to 16 if you want to push your luck.
Beyond that you'll see airy buds, and low yields, basically low quality herb.
If you can only get 1 600 watt setup, I recommend utilizing less space than 6x4.
This is only one grower's opinion, and in the end, they're your plants to grow as you please.




thanks. maybe i'll just build 2 of them.  which would be 4 feet by 3.
6 plants.


Edited by pftek (12/13/09 05:50 PM)


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Offline81renaissance
Coachella '13 KKOTY
Male


Registered: 04/20/08
Posts: 4,181
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Last seen: 4 months, 27 days
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Re: how much fan power do I need? for 600 watt HPS? [Re: pftek]
    #330785 - 12/13/09 05:51 PM (6 years, 11 months ago)

or 7 or 8 or 10 or 12...


--------------------
"So it goes."
-Kurt Vonnegut


BlueBerry_Swisher said:I want French fries. No, I want a penis French. Thank you. I'm so excited. I can not contain myself. Now I eat chocolate. It is so good. I'm trying to rub it all over myself. And then lick. Now I need a hot shower. The end.


Post Extras: Print Post  Remind Me! Notify Moderator
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