Almost a year after having the initial idea I’ve finally finished upgrading my light table. I tore out all of the corroded, nasty ballasts and fixtures and replaced them with shiny new ones. I also doubled the lighting capacity to six 24” tubes. I’m going to use this as a regular light table and for doing screen exposures.
I bought “daylight” tubes that are supposed simulate the noon day sun, but one of them doesn’t seem to work and I had to use a regular “cool white” one. The difference is only somewhat noticeable to the eye, but check out how obvious it is in the photograph below.