Question on water cooled lights and water chillers

Hey guys, so I'm considering running a pretty big setup, but I'm looking into water cooled lights versus the conventional air exhaust with tubing etc. First, does anyone have any opions on water cooled? From what I've been reading they're suppose to do wonders due to the lumen increase. So I'm trying to have Five sections of two 600 watt watercooled. How big does my reservoir need to? And how many gallons of water are needed in the reservoir per light? I read that they suggest 55 per two with a chiller; would I need multiple chillers since a single might not be able to keep that many gallons cooled? My next question would be this: Is there a chiller out there that won't sap up massive amounts of energy? I'm already putting 6000 watts just from the lights every hour for 12 hours. I'm considering running some off a generator to hide the power; I'm already looking at a $210 electric bill from this. Finally, I plan on having my veg plants there. Would it be advantageous to do the watercooled in veg or flower if I only could choose one due to electric. Thanks so much for your help guys!!

bumpidy bump

I have some of the same questions as kg707. I'm setting up a new room,(trailer) with 4x1000 lighting. I have already purchased 2 ice box heat exchangers for the hoods, and a water cooled co2 burner. I plan to use an a 12k mini split for backup in case the water cooled stuff isn't adequate or breaks down. I plan to use one ice box for 2 hoods ducted in a line, times 2 . I know they recommend 1 per 1000 watts, but I was gonna start with 2 for 4000 watts. I will also be cooling the co2 generator and 1 50 gallon nutrient res. I am hoping a 1/2 HP active aqua chiller will do the trick. Have a couple of those for sale locally for $500, brand new. (retail $750-950).
Will 1 chilled 50-55 gallon drum be enough water to cool the 4 items I have? And will a 1/2 HP chiller be sufficient?
Thanks,,,,,,,,,