14x13 master bedroom grow question

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learningthebasics27

Active Member
I was originally going to go with a 8x16 or a 10x20 grow tent but the only place it will fit is inside the front room literally right when you open the front door, so I am thinking of alternatives. Then I thought about a 10x10 grow tent but they are out of stock for at least a month so it might be worth it to just take advantage of the whole master bedroom.


Is a 14x13 room big enough to do 6 lights over a 8x12 section comfortably? I would be using 6 of the HLG 550s with co2, dehu, and a mini split AC. Not sure about panda film or painting walls. I would probably run a 30amp 110v for the 6 HLGs and then another 30 amp 220v for the mini split and then a 20amp 110v for whatever else to the grow room.

Also is it worth running a 220v 30 amp line for led lighting or just stick to 110v?
 
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Apalchen

Well-Known Member
That sounds like should be a nice room when done, if your going all out with C02 and mini split you maybe interested in an argo trolmaster controller. Pretty sure it will run your hlg lights with adaptor. It will also help you set a night day temp on mini split and control your c02 and dehuey. Mango tech store has best tech support for them. Other than that you need carbon filter and fan to control smell and plenty of fans moving c02 around. Also have you figured out what medium your going to run and how your going to deal with run off. This can be as simple as handwatering with saucers and a shop vac which is quite a bit of work(I know cause that’s what I do right now. Or you can put some money and up front time into plumbing trays and drippers which would reduce daily labor. I hope to get this done soon myself.

As far as 110 or 220 for the lights I am not sure, my new lights only came with 240 option so that made my mind up for me lol. I have always run 110 until now with no problems.
 
L

learningthebasics27

Active Member
Apalchen said:
That sounds like should be a nice room when done, if your going all out with C02 and mini split you maybe interested in an argo trolmaster controller. Pretty sure it will run your hlg lights with adaptor. It will also help you set a night day temp on mini split and control your c02 and dehuey. Mango tech store has best tech support for them. Other than that you need carbon filter and fan to control smell and plenty of fans moving c02 around. Also have you figured out what medium your going to run and how your going to deal with run off. This can be as simple as handwatering with saucers and a shop vac which is quite a bit of work(I know cause that’s what I do right now. Or you can put some money and up front time into plumbing trays and drippers which would reduce daily labor. I hope to get this done soon myself.

As far as 110 or 220 for the lights I am not sure, my new lights only came with 240 option so that made my mind up for me lol. I have always run 110 until now with no problems.
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Was going to use soil. Probably do 3 4x8 trays and just shop vac the water up. Yeah I already planned on the carbon filter fans etc. I was just trying to figure out if the master bedroom is big enough.
 
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Apalchen

Well-Known Member
Plenty of room, bigger than my room. I have 8x11 space and gonna run 4K of de hps. It has like a closet in it I’m not counting where I can put my dehuey and water barrel but otherwise it’s gonna be a very tight fit. You should be good it sounds like you have extra room which is nice for being able to get around to all side of your plants.
 
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learningthebasics27

Active Member
Apalchen said:
Plenty of room, bigger than my room. I have 8x11 space and gonna run 4K of de hps. It has like a closet in it I’m not counting where I can put my dehuey and water barrel but otherwise it’s gonna be a very tight fit. You should be good it sounds like you have extra room which is nice for being able to get around to all side of your plants.
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Thats what I was looking at! The trolmaster hydro x controller. I have come to find out that each HLG 550 v2 produces around only 800 btu an hour in heat. So with six of those thats only 4800btu. So now I do not see the point in getting a mini split, having to run electric for it and all that. Probably just going to go back to the dual duct portable ac.
 
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Apalchen

Well-Known Member
learningthebasics27 said:
Thats what I was looking at! The trolmaster hydro x controller. I have come to find out that each HLG 550 v2 produces around only 800 btu an hour in heat. So with six of those thats only 4800btu. So now I do not see the point in getting a mini split, having to run electric for it and all that. Probably just going to go back to the dual duct portable ac.
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Are you sure about that I have a 320 quantum board fixture and I feel like it puts off as much heat as a 315, just not in the direction of the plants as much but but it still warms up the tent. I could be wrong and I understand that led run cooler but I thought it would still be 3.41 btu per watt. With hid we oversize and use more than 3.41 but per watt but I figured that even with led a watt was 3.41 btu. That being said that still only roughly 10-11k btu for 6 fixutres (they at 500 watts right) so you might be fine with portable I’d just oversize it some as I don’t think they put really accurate btu ratings on portables. Prob better to go bigger on AC anyways in case you decide to add more light later on also to cover anything else in room putting out heat. Dehuey ect.
 
L

learningthebasics27

Active Member
Apalchen said:
Are you sure about that I have a 320 quantum board fixture and I feel like it puts off as much heat as a 315, just not in the direction of the plants as much but but it still warms up the tent. I could be wrong and I understand that led run cooler but I thought it would still be 3.41 btu per watt. With hid we oversize and use more than 3.41 but per watt but I figured that even with led a watt was 3.41 btu. That being said that still only roughly 10-11k btu for 6 fixutres (they at 500 watts right) so you might be fine with portable I’d just oversize it some as I don’t think they put really accurate btu ratings on portables. Prob better to go bigger on AC anyways in case you decide to add more light later on also to cover anything else in room putting out heat. Dehuey ect.
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I came across this info regarding the HLG 550s.


Input Power (W) = 472.90
Total Radiant Flux(W) = 243.13
Thermal Flux(W) = Input Power - Total Radiant Flux
= 472.90 - 243.13
= 229.77 watts as heat
For every hour of operation 229.77 Watt-hours = 784 BTU

For a 9x 9 tent x 7 feet (?) tall total surface area of four sides and roof is 9x9 + 4x(9x7) = 333 sq feet of heat transfer area ( floor not included for heat transfer)

Modeling the Grow Tentt wall material as
double bubble reflective radiant barrier
with an R value of 3.7

Temperature Delta = (R value x Heat Transferred)
--------------------------
Square Feet

Temp Delta = (3.7 x 784)/333
=8.7 (Deg F)

So, to keep Internal Grow Tent temperature at 76 F.

A/C External Room Temp = 76 - 8.7 = 67.2 F

This treats the tent as not exchanging air with the A/C room.

Venting air exchange acts as a drafty window… and drops the effective R value… requiring less Temperature Delta.

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

Well … that was for one light.
For four lights in the same tent it is 3136 BTU

Temperature Delta = 3.7*3136/333 = 34.8 degrees F

A/C External room = 76 -34.8
= 41.2 F
again …considering no ventilation between tent and A/C room.

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

In retrospect, I may have over-estimated the Rvalue of the tent wall at 3.7. Probably a more realistic value is ~1 to 1.2 so the temperature deltas would be about 1/3 of what I calculated above. Remember these calculations are based on not venting the tent, which you will need to do to get CO2 to your plants. So the temperature delta will be less when you vent the tent.
 
A

Apalchen

Well-Known Member
learningthebasics27 said:
I came across this info regarding the HLG 550s.


Input Power (W) = 472.90
Total Radiant Flux(W) = 243.13
Thermal Flux(W) = Input Power - Total Radiant Flux
= 472.90 - 243.13
= 229.77 watts as heat
For every hour of operation 229.77 Watt-hours = 784 BTU

For a 9x 9 tent x 7 feet (?) tall total surface area of four sides and roof is 9x9 + 4x(9x7) = 333 sq feet of heat transfer area ( floor not included for heat transfer)

Modeling the Grow Tentt wall material as
double bubble reflective radiant barrier
with an R value of 3.7

Temperature Delta = (R value x Heat Transferred)
--------------------------
Square Feet

Temp Delta = (3.7 x 784)/333
=8.7 (Deg F)

So, to keep Internal Grow Tent temperature at 76 F.

A/C External Room Temp = 76 - 8.7 = 67.2 F

This treats the tent as not exchanging air with the A/C room.

Venting air exchange acts as a drafty window… and drops the effective R value… requiring less Temperature Delta.

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

Well … that was for one light.
For four lights in the same tent it is 3136 BTU

Temperature Delta = 3.7*3136/333 = 34.8 degrees F

A/C External room = 76 -34.8
= 41.2 F
again …considering no ventilation between tent and A/C room.

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

In retrospect, I may have over-estimated the Rvalue of the tent wall at 3.7. Probably a more realistic value is ~1 to 1.2 so the temperature deltas would be about 1/3 of what I calculated above. Remember these calculations are based on not venting the tent, which you will need to do to get CO2 to your plants. So the temperature delta will be less when you vent the tent.
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‍ To be honest this math a little over my head. I guess I don’t I understand what radiant flux is. Or a lot of the other stuff but I see they use the same 3.412 as me for math for watts to btu but for some reason they lower it to 229.77 watts. I guess I have some googling to do but to be fair they say a 315 puts out around 1000btu and my hlg 320 xl diy kit seems to run just as hot in a 3x3. Sometimes the math is just flawed vs real world environment. For example a 1000 watt de hps should only need 3412 btu by the math but almost everyone shoot for close to 6000 btu per open fixture. Even old school air cooled fixtures needed about 4000btu per 1000 watt fixture still over what you would get if you just did the math.
 
L

learningthebasics27

Active Member
Apalchen said:
‍ To be honest this math a little over my head. I guess I don’t I understand what radiant flux is. Or a lot of the other stuff but I see they use the same 3.412 as me for math for watts to btu but for some reason they lower it to 229.77 watts. I guess I have some googling to do but to be fair they say a 315 puts out around 1000btu and my hlg 320 xl diy kit seems to run just as hot in a 3x3. Sometimes the math is just flawed vs real world environment. For example a 1000 watt de hps should only need 3412 btu by the math but almost everyone shoot for close to 6000 btu per open fixture. Even old school air cooled fixtures needed about 4000btu per 1000 watt fixture still over what you would get if you just did the math.
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Yeah who really knows, ill find out soon enough!
 
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