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I am trying to build an illuminator for optical experiments using the monochromatic light from sodium lamp. It has to be the older low-pressure streetlamp type, because the modern relpacements are high pressure lamps give out a broad range of wavelengths in addition to the pure yellow sodium...

I am trying to salvage and use a nice-looking squirrel-cage-type AC motor marked 230v 50 Hz from my bread-maker, which is kaput, but I think the motor is OK.  It has three wires attached to it: one red, one white and one black.  A capacitor with a red and a black wire is connected to the wires...