600 Watt in wardrobe

Hey guys,
Just started my first little grow. Its just the one plant (killer skunk) and its happening in my wardrobe. The space is about 1.5' x 2.5' and about 5' tall. Its a pretty basic set-up and so far I have been using a very basic light to grow it with a fan. The light does not produce much heat which i feel is an issue. A mate of mine is selling a 600 watt HPS light with a cooling fan attached to it and of course a ballast. I have a feeling this is total overkill but I am not sure? As I said, im new to this, so im also wondering how much heat will be produced by the light and what would be a better alternative?

Cheers

A lot of heat. Would need full venting pulling air outside the wardrobaimed cooling it in that room so got air is not going back in.

I fit a 400w into this so it might be possible. I've heard a 600w will make like twice the heat of a 400w though.