I've been planning a grow room. I originally planned for a single 1000w. However after reading, and reading. I determined that two lights would be better for the rectangular room. More reading brought me to the color spectrum and all the information about WHY LEDs weren't that great. Leaving me thinking about two 600w.

So, I was about to ask the same question(until two days ago).

I came to the conclusion that two 600w, with the alternating MH and HPS bulbs(switching which was in which hood) would be fabulous (Other then the actual switching itself). Even better is to add a hood spinner that rotates the two hoods all the time! Issue with these is their size(space they take above the hoods).

MANY sites and grow pros seem to agree that both for all stages is best(Most blue AND red as possible at ALL stages).

So, I plan to use two 600w OVER the single 1000w. Sence you already have a 600w. I'd say you should go with that too. The extra 200w will be barely noticed on the power bill(over a single 1000w) AND the benefits are many. Including coverage, spectrum, Multiple angles light penetrates into the canopy and more! (like yeild)

Of course using a 1000w AND a 600w is even better(other then maybe heat and power issues).

So, The question comes to that! Because could you honestly say you wouldn't use the 600w if you bought the 1000w?

Good luck :thumbsup: