Just be weary of heat. Will 2 of them be too much? Everything I read about CMH is positive, however I have a couple questions. Would i need air cooled hoods? You don't need air cooled hoods and vertical cmh are better than horizontal. Hydrofarm Phantoms work great, BUT the first time you fire up the bulb leave it on for 8 uninterrupted hours. Sales rep said this avoids the problem of bulb or ballast early burnout. Yield will really depend on the strain/pheno.when they say 1g per 1w do they mean each plant or all combined? Will 2 of them be too much? Should i try just one fixture. Now I use COBs and it stays between 77-79 This is my first run with it and it’s looking great, the plants love it. I think you could easily run two tents with one fan(if you're talking about a carbon filter).Upvoting as I’ve got a similar setup 315 in a 4x4. Any suggestions on the best hoods? The highest it's ever hit is 86 when my AC froze up a bit but typically around 79-82.
He said that the lamps are double jacketed to help with heat so the hood can run open to take advantage of one of the main benefits of the cmh.
I have sufficient ventilation. We love pictures of your plants & harvest, discussing growing methods, and helping with grow problems.Press J to jump to the feed. I run a open tent setup (4x4) in an area with ambient temps at around 72-76 with two fans. Because the light will also turn into heat eventually, and since that light stays in your room it becomes heat in your room. They pull about 240 watts each. The model I use and recommend is the 315 LEC Grow Light from Sun System with a “Vertical Bulb” orientation. Should i try just one fixture.
You can run both bulbs if you do 2One 315 is good, two is better. They pull about 240 watts each.
Without a doubt you can veg a 4x4 with one but for optimal coverage if you truly have a 4x4 canopy I would I would prefer two 315 's. For a 4x4, I would run two in veg if your room will be packed, if not, center them and just use one. Press question mark to learn the rest of the keyboard shortcuts i have read the 315 footprint is only 3x3 but i’ve heard of people using them in a 4x4.. what do you guys think?if that isn’t enough i am considering using 2 3x3s with a 315 in each.. but would like to continue using one fan so i can keep my overall energy expenditure relatively the same as what i am using now.i’m also concerned with the heat of cmh.. as i’ve been using a fan-cooled light with my hps but those don’t seem to be available for CMH. There's a few guys on here using them, all of em with great looking grows. I want to switch to cmh/lec. The terpene profile is much nicer and the resin content is much better, the flowers have an almost oily look to them. Everyone thinks they are physicists. Temps will be higher with a cmh than an LED but lower than a Metal Halide or HPS. BTUs are measurement of heat energy. watts generate heat not the type of light you use, 315w of cmh is the same heat load as 315w of leds. I know a lot of Hydro/grow stores claim CMH is not an HID, but it is. Pick ballast or ballast with lamp & holder kit build up a CMH 315W grow light with your favourite reflector. For those of us that are growing with the 315 cmh lights, andnthere seems to be more and more users. Give me a little while.
it's the first law of thermodynamics. I personally wanted the extra space so I opted for the 4x4.I've almost completed my first grow in a 4x4 with a 315. I was told by numerous grow store employees that it was plenty of light for the space. You can also find a few grows by googling where people have pulled about a pound from this set-up. For now anyways. The Uv-b from the lamp can be reduced by the glass in the hood, from my understanding glass doesn't block all uv but it will effect Uv-b, which is one of the great things about cmh lighting.New comments cannot be posted and votes cannot be castDedicated to the cultivation of cannabis. A friend of mine has been telling me to get a Growers Choice 315w CMH. I run a open tent setup (4x4) in an area with ambient temps at around 72-76 with two fans. a 630 would dominate the 4x4I’ve been using a fan-cooled light with my hps but those don’t seem to be available for CMH.I actually asked a rep for nanolux why we weren't seeing many sealed hoods with cmh.
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