need serious advice please,.....

I'm planning a room, to start growing in. The room I am wanting to use is:
47" long, by 38" wide, by 97" tall. I want to grow two plants, which I already have started germinating,... but:
My need for advice is this: is a 400 watt bulb, too much for a room this size?. And because I live in an end unit of a townhouse complex, (my bathroom is right beside the closet I'm going to use,..) my bathroom does not have a ceiling fan, it has only a window,.. so how do I exhast this room safely,, and re-supply it with fresh air so that I don't stink the play to high heavens?

post some pics, it will give us better ideas to help you out. you might just be better building a cab for that closet to grow in, or picking up a tent that will fit inside. this will help you a lot with your venting issues and will allow you to filter the out going air. as for a 400watt light you should be fine with 2 plants, i started with 4 and had to kill one off. i have 3 healthy girls under my 400watt light.