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Is 600w hps to much for small space

H

Haze420

New member
Only my second grow and struggling with heat management. A friend says a 250w would be more than adequate for a small grow of 2 plants max in a small grow room.
Currently been using 600w using MH bulb for veg and HPS for flowering.
On week 7 off this grow and both plants doing good but just the heat in room gets extreme
 

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Either add ax vent in from a colder room or get a 600 watt dimmable light and dim it to 400 either of those will solve ur issue
 
I use a 600w in a 4x4 tent . I do have a heat issue if I don’t open the tent up and let it vent while the light is on .
 
315 LEC is perfect for a 3 x 3 tent, probably a 2x2 as well. 600 watts would be too much for these spaces from what I've heard and read. with a 315 LEC you will get better results than a 400 Watt.

some folks like LED for these small tents and I can see the benefit in the summer if they run cooler. I like the penetration on the LEC and it runs only 10 degrees F hotter than room temp. in weather hotter than 80F you will need additional venting or at least a source of fresh, cooler air to pull through.
I'm only on y 2nd grow with this setup but my buds are dense and numerous
 
Cronk my set up is 3x3x6 and I struggle with heat from my 315. I upgraded to a 6" exhaust fan (Vortex, 340 cfm but quieter than others with more cfm), two clip on fans and a 12" oscillating fan. Temps everywhere are fine except directly under lights, where the plants are located! Crazy thing is that in the beginning of grows I fight high temps (low 80's), then during veg I fight low temps (low 70's) only to fight high temps again during flower. Does your set up act like that? This is my second grow with new 315 and I wonder if grow room was bigger if that would help (can't make bigger) or could it be a defective bulb??? I'm not whacked out about temps in the low 80's anymore (fuck it) but curious about the fluctuations in temps.
 
I do have days that worry me but overall it;s at 85 or below. I've gotten as high as 89 but I had to just sweat it out. no harm done. I'm in a top floor of a wooden structure so the roof heats up. Still, the LEC puts out way less heat than the other options. temps will be high right under the lights but the temps in the canopy could be a little different. The fans also remove some of that heat so it's good to check around the plants to get a good reading. If I keep my space outside the tent around 80F I will get no hotter than 85 in the tent

also, I removed my air inlet duct and cut sheets of carbon filter to cover the air flap. my wife sewed velcro around the edge so I could replace the flap with the filter. I have 2 layers. This is a bigger inlet than a duct so more air in
 
Potted said:
How small? And what size exaust fan? Lol
Click to expand...

Room is 3 x 4 x 6. 4" exhaust fan and drawing cooler air from underneath. To be fair the weather been very warm for this time of year which isn't helping the heat but so long as I open the room door while light is on its manageable it's mainly an issue if I'm not home to open the door
 

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Hey 420, nice plants, I hope you get your problem fixed.
But as for lights, it's hard to beat a 600watt hps, kinda like the gold standard, of mj, growing. They do the job, nicely, a little heat, though, but dense nugs. Lol.
 
U dident mention if u have a exaust fan taking hot air out at the top? Into a different room perhaps? I vent with a 6” exhaust fan to attic space where the attic fan pulls it outside 3 floors up, never smell a thing. 😎 outside.
 
Temps outside the range of 75-86 will not harm your plant as long as they are not extreme swings . The only real effect is that it will slow the growth as your plant as it will put more energy into heating and cooling itself instead of growth. So getting to those temps of 89 and even into the 90s will be fine . It will just slightly slow the growth. I have a chart that shows this very well and when I find it I’ll post it in this thread .
 
The link chef posted is a graph of the effects of higher and lower temps that I was talking about . Thank you for posting that chef and this is basically the same thing I had read and was talking about . I read on another site but same information about temp effects on photosynthesis . Once I solved this problem in my own grow my plants doubled in size. It’s ideal to dial in this optimal temp but the effect of straying from it will only slow you growth not harm your plant is all I was saying .
 
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