Even IF you ran them for 24hrs straight, you'd barely notice an increase in your bill.
I have a 600W HPS & notice a HUGE increase, but we get screwed in Ontario (not as bad as other provinces). I normally start my seeds around mid December so I'd be game for the next challenge. our outdoor season is rather short & have never brought a plant back indoors but would be willing to give it a shot.
I posted some pictures in the fishing thread down in the Lounge, the trip was just incredible, perfect weather next to no bugs (lucked out they hadn't started to feed yet) fishing was stellar for Walleye & Pike but we were there for the Brook trout & we slayed them, kept uping my personal best. We were in North Western Ontario about a 14hr drive from Toronto then a short float plane flight to Trident Lake & the Esnagami River
Sorry about the late posting on my Serlano, got back from a incredible fishing/canoeing expedition & bounced back into work the hard way, anyway here's my pic, this is the slowest growing plant I've ever had the privilege of growing. Going through this thread & what I've missed it's about the same size as the others posted, size of a Bic lighter roughly,