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Check your math, 15 x 42 watts= 630 watts. Over an hour thats .63 kw/hr (630/1000). So your cost is based on 453.6 Kw-hr per month. 15 x 4100 lumens =61,500 total lumens which you can place closer to the plants -since they are cooler after all. The light power decreases with the square of the...