Questions about small cab lighting (CFL).

Hi all! Thinking about one 250 wattage envirogrow cfl in a small cab, with dims 34in H x 14in W x 18in L. What do u think? What temps should i expect inside the cab?
One or two fans at the bottom for fresh air, and two on the top for exhaust.
I know that we start vegging with 6400K, and then change with 2400K for flowering. Is possible to start and finish with only one bulb (Blue/Red)? And if it is, blue or red is better to start and finish with? A mixed spectrum (blue and red) is better?

Irie
 
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