Grow Box, Need Help On Lighting

I Built A 2 x 2 Ft Grow box, Covered it entirely with Aluminum Foil
Installed A 12 Watt Fan, And I Dont Know If I Should Add 2 more...
I Added A 75 Watt Light Bulb, But I Am Looking For Something Better
What Would Be A Better Light For My Box?

I will Post Pictures Soon!

how about some brownie mix because it sounds like an ez-bake oven