Ballast for Philips Spectral Lamps

A recent eBay find, this is a ballast for the Philips series of spectral lamps, mounted in a metal project box. It's obviously not a commercial product, as there is no brand name, so I'm assuming it was put together by someone in a college lab or some such place where they used spectral lamps. It works well, although I think they used the wrong value of PFC capacitor, as the PFC when measured is way lower than it should be. Some experimentation with different values is called for..!