I have newly acquired Timber Cob lights, they are 4x50 watt so I was kinda in the same boat... I have decided in order to keep the light distance stable, I will put those babies at 24" above expected plant heights per room, I can always drop them a little alot easier than raising them in the new rooms I am building... In addition I am gonna have 3 or 4 Spectrum low watt light bulbs that will be in the 3500 range each room.... Should be plenty of light, and hopefully not too much need for heat/humidity control...
.....Each of my rooms go up in total space from 2x2.5x48 to the last which will be 32x48x70... The last will obviously be my flip room... I will have all kinda stands available to stack things, though my goal is only 3 to 5 plants at any given time in bud room... My goal is to harvest 4 to 6 zips per 45days ish.... Green evenings all