When to put seedlings under CMH

[Dee Muney]

I have some seedlings a couple days old currently under a low watt LED about 25 WATS. I have set up my tent with a 315 CMH and want to know when I can put the seedlings under this light and at what distance?

 

[Richard Drysift]

Never used CMH lighting myself but it can’t be that much different than a regular MH. I would keep them under the LED until they grow a set of nodes or two; maybe 3+ weeks from seed. If you pull up your CMH far enough; say 2-3 feet from the top of the plants it’s probably safe to put the seedlings under it right now.

 

[B|uDreamer]

My autos go straight from a seedling plug to a pot about 3 feet away from a 315 within a few days of breaking ground. Let them grow to 2 feet away then adjust to keep it there through veg. I stop raising as much in flower and they usually end up about 18 inches zway at the end.

 

[JoeBlow5823]

I sprout under a 315....

 

[dennis000]

Never used CMH lighting myself but it can’t be that much different than a regular MH. I would keep them under the LED until they grow a set of nodes or two; maybe 3+ weeks from seed. If you pull up your CMH far enough; say 2-3 feet from the top of the plants it’s probably safe to put the seedlings under it right now.

It is really much different than a regular MH.

4K MH



4k CMH

 

[Renfro]

Keep the seedlings under the LED for another week or so. No point in wasting watts lighting the floor.

 

[JoeBlow5823]

Keep the seedlings under the LED for another week or so. No point in wasting watts lighting the floor.

My 315 doubles as a heater..... House is typically kept around 67-70 which is pretty cool for a sprout.

 

[Renfro]

My 315 doubles as a heater..... House is typically kept around 67-70 which is pretty cool for a sprout.

My basement doubles as a heater. Only time I ever have to run the furnace is if it's cold ass winter AND my flowering rooms are both off like harvest time for example.

 

[JoeBlow5823]

My basement doubles as a heater. Only time I ever have to run the furnace is if it's cold ass winter AND my flowering rooms are both off like harvest time for example.

Yeah yeah brag on...... lol

 

[Dee Muney]

Keep the seedlings under the LED for another week or so. No point in wasting watts lighting the floor.

I allready have some 5 week old plants currently under the CHM so it is allready running . It’s on 18/6 the led is on 24/0 trying to get the sprouts to catch up lol

 

[Dee Muney]

I allready have some 5 week old plants currently under the CHM so it is allready running . It’s on 18/6 the led is on 24/0 trying to get the sprouts to catch up lol

CMH

I allready have some 5 week old plants currently under the CHM so it is allready running . It’s on 18/6 the led is on 24/0 trying to get the sprouts to catch up lol

CMH*

 

[Richard Drysift]

It is really much different than a regular MH.
View attachment 4618690
4K MH


View attachment 4618691
4k CMH

Ahh so the CMH has more prettier colors....

 

[.Smoke]

I allready have some 5 week old plants currently under the CHM so it is allready running . It’s on 18/6 the led is on 24/0 trying to get the sprouts to catch up lol

They should go under it now then if you're running it already.

These are under 400w MH @ 30k Lux.


500W @ 40k


Better to get them used to it asap.

 

[Dee Muney]

My autos go straight from a seedling plug to a pot about 3 feet away from a 315 within a few days of breaking ground. Let them grow to 2 feet away then adjust to keep it there through veg. I stop raising as much in flower and they usually end up about 18 inches zway at the end.

You don’t get any light burn on the top of some colas? That happened to me

 

[turbobuzz]

These two have been under cmh 315 from the day they broke soil. Day 28 flowering.