At the GIE expo last week I was looking at a light that had a beryllium socket. It was a standard mr-16 uplight, nice weight and finish, and the socket did in fact look substantial. what amazed me is that this light looked identical on the outside, has identical double o-rings, and felt about as heavy as the uplights I use. the catch, that "beryllium" thing. It must be mined from diamonds, as the fixture was about twice what I currently pay. I have not had an mr-16 socket fail, so is the beryllium thing worth it? maybe since I don't go above 35 watts on a fixture I don't need beryllium? for the record I whipped out my periodic table of elements, ( well , googled it) and man was I surprised they have filled that sucker in ! when I was in High School back in the late 80"s I remember that bottom two lines having some blank spaces and some of the bottom line of the main chart. It looks like old #117 is the only one left we have not figured out. beryllium seems to be an alkaline metal that will bond with copper to create a hard metal, thus heat resistant. is it worth it ? also- thanks to Nite tyme for talking with me at the booth, and I missed Joey d at the show. maybe next year.