Thomas. I did this at Tim Rudman's last US workshop so it was redeveloped under whatever room lights were on in a side room, probably fluorescent lights. I can get similar results at home with just regular room tungsten lights. I think its the combination of paper and lith developer (Oriental & LD20).
Cool. I have some oriental. Will try it. When I use for example Ilford Warmtone, I get a much more normal looking image, just 'colorful'. Never any of the solarization effect.