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P3D Frosting of Halogen Bulbs

  • From: "Franklin J. Flocks" <fjf@xxxxxxxxxx>
  • Subject: P3D Frosting of Halogen Bulbs
  • Date: Wed, 19 Jan 2000 13:39:59 -0700
       I am modifying a Brumberger rotary viewer to run on halogen 
       bulbs. This viewer holds 20 realist slides on a ferris wheel
       like holder - It was originally designed to use two night-light
       type bulbs similarly to those in a Kodaslide II viewer. 

       I have found both 10 and 20 watt  - 12 volt halogen bulbs that 
       will work - with a rheostat to control the brightness, but the 
       design of the viewer makes it necessary to have the bulbs 
       directly behind each film chip with a plastic defuser in 
       between.  I am getting some shadows from the filament holders 
       inside the bulbs.  I am sure I would get more even 
       illumination if I could frost the bulbs.   How could this be 
       done? - With sand paper? - If so, what kind?