And also keep in mind guys that when looking at power consumption you also need to factor in the rate it can pull out water for ex.
A 600w unit that does 70 pints. Is 8.5watts/pint
A unit that is 60w and does 3 pints. Is 20watts/pint.
Obviously the 70 pint unit will be more efficient and then shut off, hence using less electricity overall, the only caveat to it all is usually the units size. I have very limited space already within my grow closet and giving up a 1.5sf is a lot, but keep this in mind if you're not under such tight space requirements.