400 Watt grow

peracho

Active Member
So need to know how many plants I can get under a 400 watt HPS/MH grow. First time using HID lights
 

Richard Drysift

Well-Known Member
I'd say no more than 6 max but 4 would be better. Less plants is always better IMO but it really depends upon if you plan to top/train them out or not. Ed Rosenthal suggests a good rule of thumb is 100w of hid per plant. Some SOG growers might disagree....
 

Creature1969

Well-Known Member
I'll go ahead and agree with 4. When you first get started the light footprint will look like it can support more. When they get to be about a month to 6 weeks old you find that footprint doesn't seem so large anymore. If the plants are bushy, even less footprint.

I tried 6 with my 400w HID. That experience made me switch to COB lighting for my 2nd grow.
 

vostok

Well-Known Member
So need to know how many plants I can get under a 400 watt HPS/MH grow. First time using HID lights
You got them in 4 inch pots ...then 100's

just one kiddie pool? just the one then?

in 15L/3usg pots is good for a total of 6

good luck
 

peracho

Active Member
You got them in 4 inch pots ...then 100's

just one kiddie pool? just the one then?

in 15L/3usg pots is good for a total of 6

good luck
This seems a lot better than the CFLs I used last year. Gunna try Bubba Kush and White widow for the strains
 
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