Damn nice cabinet. You will grow HUGE in there if you get your lighting and heat issues taken care of. A cabinet that size will take a lot to get air moving around in there. You might want to see if you can have a few fans that point more upwards to move the heat to the top.
In regards to what type of lights you are going to put in there, 400 might be as low as you want to go. But since there is a lot of room, you might want to also consider placing some CFLs a little lower in the cabinet to make sure the bottom part of the plants get more light. Heat wonâ??t be an issue as long as you test different fan positions. If you have extra wood, you might want to try out different places to put your fans (diff heights, directions, etc). This way you can cut holes and it wonâ??t matter since it is a test.

Anywaysâ?¦good luck!