Right, from that picture I would guess that it takes a halogen spotlamp bulb
Something like this.....
If this is the case then unfortunately dude, and someone will step in if I'm incorrect but these connot be used to grow any plants whatsoever.
So, next thing to do is as I said before, go and grab the highest watt energy saver bulb (the twisty one) you can and get it under one or two of those.
Secondly, did I read you have this set-up in a cardboard box??
For yours and your families safety please get rid of it, save it for later as it'll come in handy for curing but please do n ot use this for growing in, especially with a towel or sheet draped over the top. It's a fire waiting to happen.
Tick, tick, tick, tick.... BOOM
Don't Give up dude.
Everyones here to help.
Peace.