Perfect Grow Space for 400w MH???

TwistedReaction

TwistedReaction

Well-Known Member
Hey there, I have a 400watt MH and just wondering what space would be best for a good indoor grow.. Iv researched allot but some advice from those who are actually growing would be great :)

Also the ideal no of plants that can be grown.. Got 8 on the way and gonna have to start making some tough decisions soon :shock:

Should probably just go out and get another light but for now some advice based on one 400mh would be great!!!

Thanks
 
Chem Dawg

Chem Dawg

New Member
a 3'x3' space is ideal for a 400w. Though with proper venilation ive had one in a 2'x2' space. I really wouldnt go much larger than a 3.5x3.5 for that wattage..
 
Stoobie

Stoobie

Well-Known Member
A 3-foot by 3-foot tent would be perfect for a 400-watt metal halide. You could buy one prefabricated, or make your own. If your tent has a good ventilation system, you probably won't even need to use a sealed hood.

As far as the number of plants, you could grow one big plant, 4 medium sized plants, or 8 small ones (veg to a foot or 18-inches...or until you have a nice canopy). Experiment to see what works best for you. I don't recommend doing just one plant for a first grow, because it's too easy to lose the entire crop if things go awry.
 
TwistedReaction

TwistedReaction

Well-Known Member
I can spend more so budget is not too worrying at the moment... and the space is around 2m x 2m so was looking to close a section off with mylar so that my light can be of more use...
 
Stinkbait

Stinkbait

Well-Known Member
TwistedReaction said:
I can spend more so budget is not too worrying at the moment... and the space is around 2m x 2m so was looking to close a section off with mylar so that my light can be of more use...
Click to expand...
That's plenty of space. Here's a pic of my last grow under a 400w hps with 6 plants. Next time I'm only gonna go with 4 plants.
 

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TwistedReaction

TwistedReaction

Well-Known Member
Shot bro!! Wanted to check a grow under a 400w for ages! Yea i have 8 really tiny ones at the moment but going to either get another light or hopefully end up with 4 or so that can be grown just under that 400w. haha cool to see the "car screen" in the background i also have one of those in the grow room.
 
karr

karr

Well-Known Member
I would rock the 3x3 as well, try to get a reflector that puts out even coverage.

Definently scrog that. It's the perfect size for a scrog. In that space, all things being right, you could look at 400g off one or two plants.

If you are still new to it all just do a practice run with 4 plants grown to half a foot, cut the tops off, then grow em enough two weeks or so and flower. You will get things done fast, learn a lot, and not be overwhelmed with work while learning.


I want to make a new cabinet about the same dimensions for my 400 CMH. But i just haven't gotten around to it hah.
 
Afrogrow

Afrogrow

Well-Known Member
4x4x5 is pretty good lots of space, good for ventilation and also factor in light height. a 3x3 turns into a 3x2.6 real quick
 
TwistedReaction

TwistedReaction

Well-Known Member
yea shot, looking into the scrog technique for sure. I have grown outdoor before but that seemed allot easier than indoor.. water and a few nutrients and they grew. This time there is more to look out for but indoor has huge perks :) Doing lots of research and just trying to get them from seedling into proper veg stage at the moment. They were looking a little yellow (well are) due to the ph being a little off but sorted that out hopefully. shot for the reply
 
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