Too bad about the poor reflector. Some Durst enlargers also use bulbs with a separate reflector. Some options I have considered are:

1) re-coat the existing reflector (link to reflector re-coating service http://www.optiforms.com/refurb.htm)
2) finding a new reflector in a similar size (link points to Edmond generic cold (dichroic) reflectors http://www.edmundoptics.com/products...productid=1412 and another site http://www.hb-optical.com/English/re...s/elliprfl.htm)