I regret tossing the 2x40W fixture and bulbs I had at the time. But what the (...) did I know, I was 9. :-X

We all did silly things like that at that age, I know I did. I had a reflector fitting for a crown-silvered lamp which got thrown out, they're impossible to find now. It had a 3-pin BC holder for a tungsten ballast lamp for these fixtures