Are these fittings legal, for this type of use?, I note that you said that they are used as ceiling fixtures.(Indoors, I assume)
I personally wouldn't use such a thing outside. The globe ceiling fixtures I'm talking about consist of a stamped & shaped tin base (looks almost like a little casserole dish), with a hole punched out for a snap-in lampholder.
Around the business end of the "dish" is a flange with holes for little screws.
A lip from a globe fits into this flange. The screws go into the lip, holding it in place. Nothing really to keep water out should you use this outdoors.
Rick, was that fixture the metal "base" of those things I just posted? That's what it looks like from the picture - 'course I can't really zoom in to take a closer look.
Trumpy, the adapter that allows you to be able to screw two bulbs into one socket is this:
[This message has been edited by SvenNYC (edited 07-12-2003).]