Disciple

I agree with u GG on the 30watts (psf) but i do believe those numbers can work just not as good of results will be found outside 13 sq/ft and with the light closer to the plants but we are shooting for 30watts (psf) i agree with u on that but someone whos not got much money w/a lil extra space may use it if they couldnt afford a 2nd HID and wanted to sacrifice Light for more plants
myself i wouldnt do it but who knows until seen done im sure someone will let us know maybe a bagseed grower or someone with freebies from an previous order of seeds cuz i know i aint w/mine i paid for not knockin u bagseed growers or ne freebies just sayn dont waste your money on trail and error s#it

and whats w/that itty bitty bulb chart u tossed in that link GG my list has every light known just about and thats what bulbs most hydroponic sites/stores carry ne ways for replacements ne ways not tryn to ruffle ne ones feathers just stating my opinon