CPF user altermann is still making 2x18650 holders if you contact him by PM, these are for protected cells (button top?).
So I have just ordered an SF M6, it cost me an arm and leg in Europe. My plan is to use the 2x18650 adapter because 18650 development is going on and the capacity is still being increased and because they are so easy to buy. 3x16650 adapters are not being made anymore and 16650 isn't also that common compared to 18650 (also maximum capacity of 16650 is around 2500 mAh, 18650 are 3500+ mAh).
Bi-pin bulbs are out of option for me, the adapters are not being made anymore and bulb production basically also stopped (no more WA1111, WA1185, and Tad also stopped making bulbs :shakehead).
Fortunately we still have Mark from Lumens Factory and I hope he will keep making lamp modules for many years to come.
I am deciding between the Lumens Factory
IMR-M3T and
EO-M3T.
IMR-M3T is a 700 lumens 3.4A lamp module, this requires IMR chemistry cells. Modern IMR cells are close to 3000 mAh capacity, they don't require protection circuit and are quite safe. I guess I could get maybe 45 minutes runtime of something that would come close to the original MN21 output.
EO-M3T is a 450 lumen 2.4A lamp module. This one runs fine on regular 18650, so you get the higher capacity. In theory this will have a much longer runtime compared to the IMR lamp (80 minutes?)
These lamp modules have a 20 hour life.
I think I will pick the IMR-M3T + 2x18650, just because it's an M6 and it should go maximum brightness
. But I think the unprotected cells will be too short for the 18650 adapter and I will probably need to use some spacers/magnets. Anybody else running this setup?