Do I really need a reflector?

Nice job mate! A fan blowing across it would cool it down quite a bit but you wont have any problems with it if you dont, they dont get that hot. Or you could fashion a extractor into it using a computer fan, it looks like you would be more than capable! There are some computer fans that work off mains voltage and the housing is made from aluminium, but be sure to be safe when you wire it. (check out the maplin website)
 
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