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
very cool thank you very much for figuring that out. like i said before i was just ball parking.
the link i posted in my first post on this thread was a head to head grow i did a while back just for shits and giggles. i was trying to see if floros or CFLs could really keep up with a HPS as far as being cost effective, and what the pros and cons are for each. alot of the newer growers try to use floros or not enough CFLs and have probs, so i thought i would put myself in their shoes.
to see what all probs i would run into. i had an extra HPS so i tossed it in to show the differences in useing floros and HID lighting. mostly just to have a better feel for what im talking about.
everything was ran exactly the same and i do mean everything. the same totes, nutes, clones, room temp, res temp, size rooms, ph, ppm, and same additives added at the same time. the lights were the only thing that was different.
i was going to do a head to head where 1000watts of HPS would grow side by side with 1000watts of CFLs, but i desided not to do it after i built the cabnet. it wouldve been way to much work to move 40 x 26watt CFLs everyday.
and about what you said about needing enough CFLs to have 140,000 lumans to grow next to a HPS,,,, you really wouldnt need that many to do it. you lose something like 1/2 your luman power per foot. they did a write up on this on OG. so a 140,000 luman HPS light hanging 1 foot over the plant will only have 70,000 lumans hittin the plants. and 1 foot is really honkin close for a 1000watt HPS. the CFLs are no more than 2 or 3 inches away, so more of the lumans per watt reach the plants.
