I acquired these two Omega D2 (or DII) heads from a guy who really didn't know what he had... but I did and here they are! As you can see, one is outfitted for an incandescent source which is a standard light bulb socket. The other has an Aristo Cold-Lite Grid in it. There is no voltage regulator unfortunately, but the light functions as you can tell. I'm not certain what to ask for these, but $20 for the incandescent head and $70 for the head + Aristo seems like a fair starting point. Thanks, let me know if you have questions!