Ive managed to operate 8 Gavita Flex 6/750's in an almost 7ft Michigan basement. They fitted just perfectly in betwixt the floor joices..gaining me almost another foot. About 10 more inches. I still have to keep a low profile plant canopy. Drain to waste rockwool uni slabs and 3 gallon pots of coco coir. Cant run dtw tables because of clearance. So I use saucers all plumbed together for waste water. Out of grow room to sump well. Lowest I know of for full automatic fertigation. I used to shop vac all the spent waste solution but fuk that. Pain in thee ass. Amyways... I never run the 800 watt setting on the lamps. And only 750 setting if I know I can get away with it. The 600 watt setting is just fine. Actually perfect with so many lamps and cross lighting and whatnot. With my pig yielders I can hit 26 maybe 28 zips per lamp of trimmed dried and cured grade A patient quality flowers. And with the 750 watt setting (I have to watch it - it can fry tops) i can nail 2 pounds. Double ended commercial grade DE hps really needs ALOT of height. But I like these Gavitas DE's. So much easier to hit weight numbers compared to hps SE. With single endeds It was alot more work to hit 2+ pounds per thouie. Everything had to be perfect. Temps...humidity...co2...and especially canopy/net trellis.
Ive managed to operate 8 Gavita Flex 6/750's in an almost 7ft Michigan basement. They fitted just perfectly in betwixt the floor joices..gaining me almost another foot. About 10 more inches. I still have to keep a low profile plant canopy. Drain to waste rockwool uni slabs and 3 gallon pots of coco coir.
I concur
5 1/2 feet, 7'1" to the bottom of the floor joist so the bulb is about 6'8" from the floor.