Humidity and deficiency issues.

[dw1]

Yeah I definitely think I should bring them down to 400s and get a bigger intake and hopefully that should get my heat down. Thanks people.

 

[dw1]

2x2 is about 4 square feet.

A rule of thumb is 50 watts/sq foot...

Try running one light for a while. My tent is about 8 sq, I run a 400 watt hps, and it's fine. This should also help with the temp, which you should monitor.
I have this thing, it's about ten bucks.
AcuRite 00613A1 Indoor Humidity Monitor

No sorry mate I meant 2x2x2 metre so 4 square metres

 

[Nabzter]

I'd always bet on over feed. Remember less is always more !! Are you growing in soil or coco ?

Also I wouldn't worry about changing to 400s just stick to 2 x 600w it should be fine.

 

[dw1]

Soil and I always start off really low and work my way up slowly. My ph is always spot on as well.

 

[dw1]

I'd always bet on over feed. Remember less is always more !! Are you growing in soil or coco ?

Also I wouldn't worry about changing to 400s just stick to 2 x 600w it should be fine.

Thanks mate, are you sure 2 600s is enough for that size space? I had 2 in my smaller Dr 150.

 

[Waira]

...light/heat damage mostly, mate... and indeed, this can lead to defc.'s too! The plant closes up the stomata, trying to limit water losses,... when that happens, the flow of water/nute's from the roots up slows waaaay down, and can cause a sort of temporary defc., cause by the lack of transport,... like Brim said, there's no way around it, too close/intense, too hot = burning,..