yeah but turnin off lites may cause stress but im not sure so much if in veg stage. but flower if ya interupt lights it'll be stress.
ya knwo tho, if you add even more cfl lites in that lil box ya gona end up wit some heat issues wven wit that pc fan JMO.
ime i found that cfl's do put off more heat than ya'd think.
but eliminating teh tin foil will help but maybe not much but tin foil seems to wanna keep heat in/ as well as wit wat so many use them first aid safety mylar blankets. i tried that as well but heat was extremely hi but i went to white an all is good. not sayin it would solve any heat issue if ya crammed lie 4-8 cfls in there. ya also gotta account for space taken from said light fixtures etc. honestly man i'd think of somethin wit a lil more ehad room may rig up a card board box same as ya got here. and if ya got storage room or closet just set it in there stacked around it bunch of other boxes but be sure you maybe get some cheap drier ducting and vent it out the closet some how. but dependin on room if storage room ya may be fine wit just ventin into room if it stays cool or can even open a windo or have an ac in room.
plus i would think a cardboard box would possibly breathe the heat a bit mroe than thick speaker box wood. but who knows.
or heck. hollow out an old dresser or file cabinet and glue drawer panels all to a board as single door makin it look as tho it still a dresser. i've seen that before.
also most growers plant in smaller containers an increase in size. meanin u coulda had these insmall 4 inch pots for a good few weeks an would give you considerable head room too. but i wouldnt recommend go diggin em up now tho an doin it.