Really really confined space

[solacecai]

I'd really appreciate any advice on how to make this work.

I've got a tiny space to work in, by tiny I mean it's about 1 1/2' x 2 1/2' x 1" (WxHxD).
I've got the ventillation and air flow mostly figured out. I have 1 fan for it, its just a small desk fan.

I know I'm gonna grow in soil, just don't have the $$ for hydro right now.

I'm planning to use 250 watt flourescent bulbs since the space is so small, I definitely don't want it to catch on fire.

What I need help with is how to keep light from seeping in from the vent hole, I can't find any duct stuff small enough, and I can't make the hole bigger because of the fan and wiring.
I also can't figure out how to attach the light fixture in such a small area with out it causing problems when the plants grow.
I know there are methods to keep the plants short, but I'm still worried about scorching my plants.

thanks

[BongHitBoy420]

All images off yahoo image search.
Ideas...

[gt420z]

you can do it just have the fan blowing across the top of the plant and light. i do that with mine i keep the light 1 to 2 inches away and they love it. search for LST to keep them short and bushy