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Dan,
If you are driving the bulb at 12.8 volt (maximum drive) and you are running the bulb in a Megallanium with 3 x 18650s each having 2000 mah, and the amperage drawn by the bulb at this voltage is 5.8 amps (see Lux Luthor's Destructive Incan chart), the runtime would be 1.02 hours ( 3 x 2000 = 6000 mah / 5.8 amps = 6 amps / 5 amps = 1.02 hrs.). This is how much runtime 3 x 2000 mah 18650s would give you. Smaller batteries would produce less runtime. That is why FiveMega lists the recommended batteries as 18650s or 26650s (see p. 1 of the thread).
for future reference, is the G4 a bi-pin bulb that'd work in your Surefire M6 bi-pin adapter?
fivemega said:
FM1909 will be slightly underdriven but will be bright enough.FM, I have an FM1909 bulb coming my way from CPFMP. That being said, I also have a "Black Edition" PhD M6 with the highest voltage setting on it being 10.8v.
That 10.8v setting is acceptable for the FM1909 bulb, correct? I don't want to risk flashing the bulb is why I ask.
Thanks man!