Crispi, you're putting on a quite a bit of WOOD by growing large trees (but they are SO beautiful!!!!).
The 'month' part is just as important as the g or w.
Maximum efficiency is from rooted clones in SOG. In that setup, the BULK of the energy that the little plant puts into its short life is in bud production... I'd actually like to see some of your numbers for g/w/m TOTAL DRY PLANT WEIGHT, buds, roots, stalks, leaves, and all, not simply dry buds... you'll see where your electricity is going.