[samiam]

So I just switched from using MH to CMH in veg. plants looked great under the CMH the first day but now going into the 3rd day they look droopy and tired. It's not over watering or heat stress. I have the lights turned down to 400 and about 4 feet above the canopy.
So is that just normal for them to look this way under CMH?

They don't really look wilted but you know like if they could make a facial expression there tongue would be hanging out.

[tleaf jr.]

Just had this happen...ph was my problem and slight rootbound what wattage were you using before?

[Snook]

4 feet is pretty high for 400w setting..

EDIT: I'd look at too much water again..

[samiam]

There in mini rockwool cubes, they get pretty dry in between waterings. My pH run off is 6.0, nute mix is 5.8 ph going in.

[samiam]

I should also mention it's 6 lights turned down to 400. 24 hours light

[tleaf jr.]

I would try to get that run off lower looks like onset of a ph problem. hope this helps....

[hyposomniac]

Originally Posted by samiam

I should also mention it's 6 lights turned down to 400. 24 hours light

Cut back to 18 or 20 hrs, see what happens. Probably meet dli goal easily

[moose eater]

Growing medium moisture content?


Excessive nutrients/salts/tds?

ph?

Needing some dark time?

The Cosmos hates cmh? (Just kidding).

[samiam]

fed 1.1 EC. 10-15% run off each watering. pH run off is 6.0.

[Spaventa]

Maybe with the superior daylight spectrum of CMH you can now see your plants better? They were probably nearly dead under ye olde MH but you couldn't see.