Can anyone tell me what these acronyms related to lamps for tungsten lights mean?

B&H offers these as accessories to their tungsten lights, listed as:

FAD Lamp
FFM Lamp
etc.

But I ain't got a clue....

Those are specific models of lamps (bulbs) they may vary by color temperature, average life, wattage etc. Osram used to have an online catalog of all the lamp specs.