heat

right got extractor fan,intake,outake,got a fan on the plants and just under the light to blow the heat away,the plants are 4 week into veg,using 600w light set,dual spectrum bulb(sunmaster)everthings good till nw,done my research had a look on the forum alot but dnt know what to try nw.i think its heat stress cos the edges of the leafs are turning upwards not on all the plants just 3 or 4,i have left a door open to decrease heat opened more windows in the house but the curling wnt stop.is there anything i can do to decrease the heat down a little more?

tried to get sum pics but the light interupts so waiting on new camera lol.

try moving the light up a couple inches

Do you have an air cooled hood? Just remember sucking is more efficient than blowing.

What is the air temperature in the grow space? If it's around 75F and the stress only appears in the top leaves then you need to raise the light. Otherwise you may need some AC or a better exhaust.

yeah it is only the top leaves,done what you said and raised the lights another 6inch,things seem to be doing better and the leaves that were curling seem to be un folding slowley so cheers lads for the advice.