Too big for Small Space?

I got this light from a buddy for another setup its a Mh400 watt is this 2 big for the small space?

I also gotta seal off the closet! LOOK AT THE LIGHT LEAKAGE! Im only going to be doing a 2-4 plant grow in this closet and cloning on the other side. Just wondering if this light is 2 big for this small space, I have another setup in the basement using a couple of hps but Ive never used a Mh

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Also don't worry about the cage on the lamp Ill be removing that, it was on there for protection from objects

After looking around on google this doesn't even look like a Mh bulb.. looks like a hps I tried taking a picture on my iphone with the light on, no luck :P

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http://www.sunsplashnursery.net/images/lamps_mh.jpg

The inside of the bulb looks a bit different but it looks like the Bt-56

Sorry for doing tripple post, After doing some research and watching Jorge Cervantes I think the bulb is a 400watt High Pressure Metal Halide

http://www.sylvanialightbulbs.com/ca...ania/64787.jpg

Thats the bulb im using. For some reason the stem on mine is a bit longer but maybe its just a new/old bulb?