Quantum board question (Mars Hydro)

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e30driftin

Member
Does anyone have one of these Mars Hydro’s? I have a 4x2 grow tent and wondering if these run hot. I currently have a viparspectra 600W and the tent gets way to hot and really don’t want to run an AC unit if I don’t have to. Any recommendations for good inexpensive quantum board or cobs that won’t rape my wallet to badly? Before I go DIY for the lighting.
 

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diggs99

diggs99

Well-Known Member
Hey,

nothing will truly compare to diy when talking bang for your buck. Im sure you know this already, just stating it again lol

The cheapest qbs that seem to be growing real well are the Chinese knockoffs(Fotops800). Theres a huge thread about them with many growers using the fotops and others. I cant speak to the Mars sp1000 or 2000, ive seen a few guys using them but havent followed along enough to know how they did.

With boards i would never buy pre built, theres barely any wiring to deal with and you really just need to make a frame, imo you should just buy boards from whoever( Chinese knockoffs, @Prawn Connery(Highlites) or HLG, buy a driver from digikey or arrow and get yourself some U channel or angled aluminum or something for a frame.. You will have a light that will be as good as anything you can buy and for much cheaper than buying it pre built.

If you wanted to use strips and werent overly handy with electrical, id def reccommend buying, the wiring alone can be overwhelming depending on the size of lights you build.

Best of luck, sorry i couldnt offer more on the mars
 
Airwalker16

Airwalker16

Well-Known Member
But to answer your question, yes, they run hot. Not scorching, but quite hot. Luckily, drivers can be removed from the top easily and moved outside the tent.
 
Horselover fat

Horselover fat

Well-Known Member
All lights that draw the same ammount of power will produce the same ammount of heat. No way around that. You can reduce heat if you can produce the same ammount of photons for less power consuption.

Go for ~320w of quantum boards (or similar tech) and you will have more than enough.
 
E

e30driftin

Member
Airwalker16 said:
But to answer your question, yes, they run hot. Not scorching, but quite hot. Luckily, drivers can be removed from the top easily and moved outside the tent.
Click to expand...
How hot does your tent get? Mine would hit 90s with just a huge fan inside. Trying to find a light that doesn’t make the tent that hot
 
323cheezy

323cheezy

Well-Known Member
I can tell you from experience that they work fine and don’t get so hot .... a fan will take care of a heat issue no ac needed ,but that being said If your running them 18 hrs plus they be a slight rise in temp . I don’t use a tent so I could have a different experience than you would
 
E

e30driftin

Member
coreywebster said:
You really need to actively exchange the air, though the grow is small and air will exchange passively with just the doors open, its not ideal for many reasons.
Click to expand...
Yea I’m working on getting one. What cfm rating do you think would be sufficient for this size tent?
 
coreywebster

coreywebster

Well-Known Member
e30driftin said:
Yea I’m working on getting one. What cfm rating do you think would be sufficient for this size tent?
Click to expand...
That depends on what your ambient temps are, say if your room is 70 degrees and you want the tent 80 then obviously it takes less cfm than it would if your room was 78 degrees and you wanted 80.

The calculation for that is
CFM = 3.16 x Watts / DT(°F)

Watts is the lighting power (and any other 'hot' things in the grow space) in Watts.
DT is the allowable temperature rise within the enclosure (i.e. desired temperature minus ambient temperature) in °F.

So, to work out the size of fan required (in CFM) simply plug your lighting Wattage into the equation along with the DT value.

An example is:
Ambient temperature = 20 °C
Target temperature of the enclosure = 25 °C
DT in °C = 25 - 20 = 5
DT in °F = 5 x (9 / 5) = 9
Lighting Wattage = 250 Watts

Plugging these values into the equation gives:

CFM = 3.16 x 250 / 9 = 87.77
 
E

e30driftin

Member
coreywebster said:
That depends on what your ambient temps are, say if your room is 70 degrees and you want the tent 80 then obviously it takes less cfm than it would if your room was 78 degrees and you wanted 80.

The calculation for that is
CFM = 3.16 x Watts / DT(°F)

Watts is the lighting power (and any other 'hot' things in the grow space) in Watts.
DT is the allowable temperature rise within the enclosure (i.e. desired temperature minus ambient temperature) in °F.

So, to work out the size of fan required (in CFM) simply plug your lighting Wattage into the equation along with the DT value.

An example is:
Ambient temperature = 20 °C
Target temperature of the enclosure = 25 °C
DT in °C = 25 - 20 = 5
DT in °F = 5 x (9 / 5) = 9
Lighting Wattage = 250 Watts

Plugging these values into the equation gives:

CFM = 3.16 x 250 / 9 = 87.77
Click to expand...
Thank you
 
Rocket Soul

Rocket Soul

Well-Known Member
coreywebster said:
That depends on what your ambient temps are, say if your room is 70 degrees and you want the tent 80 then obviously it takes less cfm than it would if your room was 78 degrees and you wanted 80.

The calculation for that is
CFM = 3.16 x Watts / DT(°F)

Watts is the lighting power (and any other 'hot' things in the grow space) in Watts.
DT is the allowable temperature rise within the enclosure (i.e. desired temperature minus ambient temperature) in °F.

So, to work out the size of fan required (in CFM) simply plug your lighting Wattage into the equation along with the DT value.

An example is:
Ambient temperature = 20 °C
Target temperature of the enclosure = 25 °C
DT in °C = 25 - 20 = 5
DT in °F = 5 x (9 / 5) = 9
Lighting Wattage = 250 Watts

Plugging these values into the equation gives:

CFM = 3.16 x 250 / 9 = 87.77
Click to expand...
coreywebster said:
That depends on what your ambient temps are, say if your room is 70 degrees and you want the tent 80 then obviously it takes less cfm than it would if your room was 78 degrees and you wanted 80.

The calculation for that is
CFM = 3.16 x Watts / DT(°F)

Watts is the lighting power (and any other 'hot' things in the grow space) in Watts.
DT is the allowable temperature rise within the enclosure (i.e. desired temperature minus ambient temperature) in °F.

So, to work out the size of fan required (in CFM) simply plug your lighting Wattage into the equation along with the DT value.

An example is:
Ambient temperature = 20 °C
Target temperature of the enclosure = 25 °C
DT in °C = 25 - 20 = 5
DT in °F = 5 x (9 / 5) = 9
Lighting Wattage = 250 Watts

Plugging these values into the equation gives:

CFM = 3.16 x 250 / 9 = 87.77
Click to expand...
Bookmarked! Beautiful piece of info!
 
E

e30driftin

Member
Airwalker16 said:
Absolutely necessary if you're growing in a tent buddy. Get a 6" or even a 4" will do, and evacuate the air from the bottom when using LEDs. Pull the heat down over and through the canopy. Warmer leaves, faster growth.
Click to expand...
Yea I’m researching inline fans at the moment. Going with a 6” for sure
 
Airwalker16

Airwalker16

Well-Known Member
e30driftin said:
Yea I’m researching inline fans at the moment. Going with a 6” for sure
Click to expand...
These literally go out of stock every 2 weeks then take months to restock. do not sleep on this fan. they are BY FAR THEE BEST cheapest fan that works more silently than any other one I've used. Which is a lot.
Built so well. Never brakes. Look no further imo.
They do require a controller to dial in speed. Be aware there are other models with a controller built into the power cord if you don't have one. but most people do so this saves so much money.

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