GE and Westinghouse M2, M2B
Smaller than GE #5 bulbs (large blue bulbs in picture, shown for comparison), these bulbs require an adapter to fit into 5" or 7" reflectors. In such a reflector, they provide an even light. Flash synchronization time may differ from #5.
Sylvania M3
Smaller than GE #5 bulbs (large blue bulbs in picture, shown for comparison), these bulbs require an adapter to fit into 5" or 7" reflectors. In such a reflector, they provide an even light. Flash synchronization time may differ from #5.
AG1
Really small bulbs. Main users seem to be model rocketry, for engine ignition.
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Photo by Deane McArthur.