I just bought an old federal enlager 35mm to 6X9 (1939 issue) to convert to a point source. I selected the federal because it has narrow lamp housing. Any ideas concerning a small clear bulb? I have an old Durst Color head that I can canablize for it's halagon bulb. A couple of years ago I bought a Russain 35mm point source enlarger that uses a very small tungston bulb, looks like a large flash light bulb, all I had to do was get a new tranformer to step the voltage up to 220.