Going back through this thread it really amazes me how time flies. Posts from 2009 seem like yesterday.
Anyway I did find one of my FTL (CP43) 2000W lamps I got in 2009 and it does indeed fit in the hole in my reflector without enlarging the hole.
So, it looks like there were two different versions of the FTL, one with the bulge and one without.
What I cannot answer right now is if the FTL (CP43)
without the bulge is still in production.
The picture below shows two different FTL (CP43) lamps from different sources. Top one is 36mm, the bottom one is 26mm.
Attachment 201698
Attachment 201703
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