Plant of the Month: Sept 2015 - Nug of the Month: Jan 2016, May 2018
Or even disregard the wattage completely and figure yearly return. Using the same wattage for a years worth of grow no matter growth time, a years a year.
4 crops at 2800 a crop= 11,200
3 crops at 4225 a crop= 12,675
Then if you want to go even further, your using 1 more crops worth of dirt/coco. 1 extra crop to trim/package/distribute. If your a provider that's 1 more crop to pay testing fees on ($325 per test) have to test trim, hash, oil, rosin separate.