It is really hard to bother with accurately calculating it all. The cost is too damn high. Plus, I started adding supplemental lights in. I re-purposed my photography lighting. 2, 5 way CFL heads with independent switches. I have all 5500K bulbs for now, but will be adding some 3200 and 6500 soon. Other than that, it's back to blurples after this grow, I can't afford fancy lights anymore than I can afford fancy electric costs. Nutes add up FAST in a large volume reservoir.