CFL:

6x13x12=936 watts per day

6 weeks * 7 days a week = 42 days

936*42=39312 watts per growing period

39312/1000= 39.312 kw per growing period

39.312 x .146 = $5.73 per growing period on CFL lighting all other things equal

5.73/1.25= 4.58 per ounce in electricity

HPS
1x1000x12=12000 watts per day or 12kw per day
12kw per day x 42 days =504 kw per growing period

504 X .146 = $73.584 PER growinrg period on hps all other things equal
73.58 / 2.25 = $37.70 per ounce on hps

4.58/200 = .0229 or 2% of street cost CFL
37.70/200 = .1885 or 18% of street cost HPS

16% differential in cost


hrmm that is VERY INTERESTING

as I said I didn't do any hypothesis testing or regressions but this looks significant enough to look into
-pot