Thanks! You confirmed I was in the correct ball park, under my calculations 4x plants per light I'd use 6 gallons per light, which was calculated at worst case.
I've not grown for a couple of years because reasons, and I'm wanting to use an automated configuration with 6" rockwool blocks. I don't have a good handle on watering amounts. If I want to have a reservoir for a week, what size of reservoir tank should I calculate under 1000 watt HPS , I'm...