Your lights are correct for your space, and you have another choice, which is to replace the HOODS with ones that may be air-cooled. They are GREAT!
Also, if your ballasts are in the same room as your plants, put them somewhere else- a ballast makes a LOT of heat.
I would not recommend replacing the light you have with either of the configurations you suggested. You will still have heat problems with either; a 600 is not much hotter than a 400. Air cooling the lamp is the most efficient option.
stinkyattic Reviewed by stinkyattic on . lighting info needed i growing in a room 8foot long x 4 foot wide x 7 foot high and have been using 2 x 600w hps lights but its been getting too hot in there during the warmer months even with extractor on full i was wondering if it was better if i got 2 x 400w hps lights or 1 x 1000w hps light to replace. can you tell me if one is better than the other please or if there is another solution Rating: 5