leaves turning yellow/brown

[Growmemore]

was using a 125w cfl and they were fine nice green leafs, then i changed to my 600watt hps and the next morning the leaves were yellowy green and bit of brown on them... the light was 25inches away

 

[Tokin Anonymous]

Light stress burnt them.

 

[Noob grower1]

Temps???? Hps puts some heat out.. sounds like u cooked em

 

[hydrosoil78]

you need more ventilation too upgrading like that, check humidity and watering

 

[Growmemore]

humidity 50%, I have a bigger ventilation kit for the 600watt hps, I'm using it atm and tempature is 79. I don't think its nothing to do with the light now btw, i changed back to the cfl to see how they go and stayed the same... i think its a nitrogen defiency... any idea how i can make this better?

 

[Sunbiz1]

humidity 50%, I have a bigger ventilation kit for the 600watt hps, I'm using it atm and tempature is 79. I don't think its nothing to do with the light now btw, i changed back to the cfl to see how they go and stayed the same... i think its a nitrogen defiency... any idea how i can make this better?

We need pics please.

 

[Tokin Anonymous]

Yes pics please, but if they burnt and you put them under the cfls, they wont just un-burn. 600watt hps should probably be at least 36" from them.

 

[Bakatare666]

humidity 50%, I have a bigger ventilation kit for the 600watt hps, I'm using it atm and tempature is 79. I don't think its nothing to do with the light now btw, i changed back to the cfl to see how they go and stayed the same... i think its a nitrogen defiency... any idea how i can make this better?

You need to give more details, like age of plants, feeding schedule, PH, and pics would help a lot.
If you're waiting for the leaves to heal, forget it.