I just bought some spare bulbs for my 23C with a dichro head. They are 24v 200W (EJL). I bought mine from replacementlightbulbs.com for $5 each. They are listed as value bulbs. These are bulbs that were purchased from store closeouts, and are old stock, new in the box (tested). I found them on a google search when I wanted to order some bulbs. Real nice folks to deal with.
My 23C is the older "blue" model, as is the dichro head. I could be wrong, but I think the 23C dichro heads changed to an 82V bulb sometime after the "blue" models. I'm sure someone here can set me straight.
I use a "conical light integrator" with the dichro head since I like to use the condensers rather than diffusion. It focuses the light from the dichro head into a mixing chamber above the condensers. It seems to significantly brighten the image.
My printing times are as follows:
8X10 from 35 or 6X6 10-20 sec for black and white
8X10 from 35 or 6X6 3-5 sec for colour (damn that colour paper is fast)
I usually print at about f8-f11