I think you should try it. U already have about everything done. All u have to do is mount it. If it helps temps, the lesser light output probably won't matter.
Yeah i feel you on that, i got a hydro store right down the street.I buy a quart a month and just leave the top off the jar. Im a total believer with this grow at least. I suppose i could save money by buying a gallon pail and refilling the quart jars myself. the bummer is i Just haven't found it locally yet. so i have to order the stuff and pay shipping.