I see troubles here a brewing....
First, you will be lucky to get 18 lollipop plants flowering in there.
(To the guy with the stacked rubbermaid tubs.)
Second, your planning on a 600W HPS inside of rubbermaid tubs? I hope your cool tubing and venting well, it will sound like a jet engine to keep that tiny thing cooled properly.
Third, you have no adjustment for your lights... How are you going to control stretching?
(End comments to that guy...)
Fourth, it takes much more than only one hour of no water being pumped to ruin the harvest. I left my pump off for 8 hours and I thought I was screwed. Plants kept on trucking.
Fifth, a plant requires a ton of water at maturity, my plants will gladly drink more than a gallon a day.
Ok, that is just my two cents on the subject.
Also, the smallest I could grow my strains would be 2ft tall and 7" in diameter, you have to account for air movement too. I would bet 7g to 14g per plant in this type of setup and that is with 16 plants so they have room to breath and grow. About 4 ounces is a more realistic number in my opinion.