Boat came with four of these. I've
converted two to LED and the other two are surplus and now for sale. These are the Bavaria original ones and take a TL 8W (300mm) CFL, or LED tube (see modifications forum).
As I've picked the better preserved ones to keep, these two are a bit green in places and the silly chrome-on-plastic is peeling off in places. Therefore cheap - £15 for both, incl. tubes, plus shipping. Both tested and working.
If you like, you can also have the CFL electronics (as backup or whatever - easy to replace) from the two I've gutted.