Try switching out your halogen for an LED. The lights are now available for nearly all applications. The light is more intense and more “natural.” Actually, the whiter light makes seeing the hairs better. The lamps are also completely cool and that makes the patient more comfortable. (I am currently switching all my “in ceiling” halogens to LEDs. Yes, a very expensive task, but worth it in the long run because they use only a fraction of the wattage.
Here’s a website that will probably have a lamp for your use:
http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2Fspecs%2FMR16-x4W-x.htm#photos