ok....
right your setup, and its limitations.
1. how much height is there?
2.whats the dimensions length.width of grow area.
that bedlamp is no good. in my opinion you need at least a 250watt high pressure sodium (growlux, son-t, sunmaster)
personally if you have approx 1metrex1metre get a 400watt one.
them vents you have, you need to work out which way the air predominantly sucks in from and expells from, and have your air intake/outtake correspond to that.,
line around the vents with a poison insect pen, summat to kill the fuckers as they crawl in .
"I" personally in your situation there by looks of it go one of two ways, dig a hole deep enough to allow a 3ft plant, + 1ft lightspace, or grow lots of real small plants.
because of the placement of your vents ie people can go right upto them, make sure no light seeps out n they cant look in youd need the charcoal filter to be safe too.( yes people look in vents, even 25ft up in the air nosey twats fucked my grow up!)
one plant the authorities wont give a fuck about, but if you grew loads and was hiding them like that ill tell ya now, they play on the "hidden" trapdoor, "secret" room shit in court and your lil grow ends up with a description like theyve just found atlantis.
you NEED a proper light, or youll just be wasting your time.
ive never seen a half decent grow from anything but hps lights.
the seedling looks healthy though