315 Migro CMH hang height?

nurrgle

nurrgle

Well-Known Member
For seedlings I would keep it pretty high at first. Probably right from the top of the tent. Once your babies get a bit taller and have some roots going lower it down to 2’ or so.

I just setup a room using 315’s and have found 2’ to be good for my purposes.
 
lee1000

lee1000

Well-Known Member
Your seedlings will stretch when the lamp is that high, i would suggest cfl's for the first couple of weeks. Why waste that much energy on seedlings is also something to think about.
 
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Leeski

Leeski

Well-Known Member
As nurrgle said is good advice imo - if they start to stretch lower the light a little at a time if the get really leggy you can always bury the stems a little deeper when you go up a pot size ☮
 
Rymaster18

Rymaster18

Member
thanks for the advice guys. these will be auto flowers however so im not trying to replant at all. think im gonna run 3 or 4 cfls for the first week or 2 then turn on the 315 a few feet away from the plants
 
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nc208

nc208

Well-Known Member
lee1000 said:
Your seedlings will stretch when the lamp is that high, i would suggest cfl's for the first couple of weeks. Why waste that much energy on seedlings is also something to think about.
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They will not stretch when it is hung that high, I'm using a 315 in a 3x3x6 and its hung at the top approx 4' away, inter nodal spacing on multiple strains is 1 cm on average and the plants are staying quite compact sitting on the ground of the tent.

In a 2x4x6 tent your gonna have the same issue as me, I hope you got a huge ass fan for extraction as that light is going to heat up that small space quickly.
 
O

oill

Well-Known Member
nc208 said:
They will not stretch when it is hung that high, I'm using a 315 in a 3x3x6 and its hung at the top approx 4' away, inter nodal spacing on multiple strains is 1 cm on average and the plants are staying quite compact sitting on the ground of the tent.

In a 2x4x6 tent your gonna have the same issue as me, I hope you got a huge ass fan for extraction as that light is going to heat up that small space quickly.
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Yeah cmh has plenty of blue so you won't see much stretch... I agree. 5 feet away for seedlings i would say
 
Rymaster18

Rymaster18

Member
awesome that's great to hear. and getting a 4 inch carbon filter/fan setup, im hoping that'll cool it along with 2 small fans
 
nurrgle

nurrgle

Well-Known Member
You should be fine on heat. I have 15 in a small basement room with no AC

Smell on the other hand might overwhelm our filter
 
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