Big Glass Box

greetings all, ive got alittle query, ive currently got 3 fem bagseed plants which are about 2weeks in to flower, my problem is due to very small budget i hav them under about 180w of cfl's . my plan to get a 250w hps has fallen through, but my parents have just completed building basicly a massive conservetry on the back of our house, its litrally the size of a council house haha with a balcony within it which used to be the outside (wont post pics as its quite unique and wouldnt want to risk being recognised). anyway ive just been given permision to put the girls in it. i asumed this would be a massive step up but seeing as at the mo we only get 8 or 9 hrs a day would it be? i cant imagine it can be worse that 180w between 3 (60w a plant). obviously wen the hrs get above 12 ill hav to stick her in a darkbox . the temps are no problem an concidering the si ze of the bstructure ventilation should be ok to right?
manythanks ,higgins.

no opinions?

Sounds awesome man ,,throw the cfls out on them too

i should think that would be adequate, maybe you could use the cfls to give the extra light time length. airflow and all that will be fine. i personally wouldn't worry about the plant getting only 8-9 hours of light, because its the dark period that lets te flowering hormones flow; sunlight(light) cancels this out, until the plant gets AT LEAST 12 hours of dark in a 24 hour period- more dark shouldnt hurt. use this as a learning experience(everything is!)

peace and good luck