Can anyong alert me if it's possible to adapt the M3 bulds wirh the later adi?? The female insert looks relativelt the same. Thankz everyone,FixerF.I,ve seen mention of adapters, but the rreceptocals appear simillar between the two bulbs in questim.Ant help?? Thanks Bruce

Adapters are available to use M-3
type bulbs in the bayonet sockets. You just have to hunt for them.

I have one of the usual sort, but about a month ago I sold one with it's own built-in reflector of about three inches. It looked as if it was designed to work with a right-angle Heiland or Graflite head.
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Cress offers a wide variety of adapters, including quite a few that I'd never seen nor heard of. They're listed on his "flashguns" page,

http://www.flashbulbs.com/flashgun.htm

and include the following:

Screw base to Bayonet #5
Screw base to Bayonet #5 etc
Screw base to M 2,3,5 25
PF 1,3,4,5 to Bayonet #5 type
Screw base to test light
Bayonet to M 2,3,5,25
Bayonet to AG1
Bayonet to screw base

I regularly used the "bayonet to M2" (etc.) kind, and late in the game, I got an AG1 to miniature bayonet (M2, etc.) adapter which had its own tiny reflector -- about an inch and a half in diameter, if memory serves.