You need to control temps with the light you have now. the 600w. It is summer and a little harder but, just read what I posted above and you should be alright. Now if you can vent outside the space, then you need to supply that room with AC. I use both in the summer.
319 Reviewed by 319 on . lighting my tent with a 600w dual spectrum - Help i'm a 1st timer bought a tent kit that came with a 600 w (sunmaster dual spectrum) however even with my 5" fan and filter I'm running temps around 100f. should i buy a lower watt Metal halide bulb for the veg stage? then switch at flowering with the addition of another inlet fan to keep temps lower during the end stages? I've got the light approx 1 metre above my seedlings (running 18/6), they are stretching up (currently 2 - 3inches) and the 2nd set of leaves are showing through. Would appreciate Rating: 5