Temps. way to low in tent..Any suggestions!!!

Heres the set-up: 2x4x7 tent,400 watt air-cooled light,6" centrifgual fan(500 cfm's w/ speed control set at lowest setting, no carbon filter set-up at this time.. I have passive intake w/ only one side of the light ducted to the fan. The other side of the hood is open to suck in fresh air and then through the hood to fan and out.

Light and fan run at the same time and temps are 63 in tent. Would any of you suggest that I vent the other side of the light and draw air from out the tent across the light? But then will i need another source of exhaust or do I remove the glass from the hood and just suck fresh air from the hood? Or do I just set a timer on the fan to exhaust the air every hour so the temps don't drop any more. Any comments good/bad/indifferent are appreciated from you seasoned pro's. Thanks.........................
 
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