I didn't mean to ever recommend this converter for use with 4.2V cells due to the consideration that any voltage above the Vf of the LED and some presumed overhead, the excess voltage would be burnt off as heat. The converter can handle input voltage up to 4.5 but its efficiency would suck for want of a better term at higher voltages. I think I put in a 3.5V ceiling in the chart and this not as an actual limit but as a practical limit. I believe there are some rechargeable cells that are in excess of 3V but not as high as the 4.2 Li-Ion? I wanted to allow them for reasonable consideration.
I think one way to compare the AA converter to the 3S would be to consider it a "miser" version of the 3S. On high it puts out 300 mA to the LED VS the 500 mA or 660 mA of the 3S, depending on LED used. As far as being able to milk all the juice out of a CR123, yes the input voltage floor is way down there but once the battery is depleted to the point that it can't provide the power requested of the light engine, the LE is not going to perform as desired. I don't know if it can effectively milk more power from a spent CR123 than the 3S or not. :shrug:
FYI: it appears that a very brief ( < 1s ) momentary bust of V that is way to high will not blow the converter...
I put a AA Mule head onto a 2xAA body that I forgot I loaded in two 14500's for a different E head
I realized it right away and shut it off... no apparent damage done, but I'm not gonna test it again
Don, I sent you an email on 10/29 for a Haiku HiCRI 119V head with AA converter. Checking to see if you received the email.
I have two Haiku’s with AA converters and can’t see PWM. I’ve gone out of my way to see PWM with them and never did. The reason I went with the AA rather than the 3S is because it doesn’t have it as mentioned in the first post of this thread. Maybe it was a recent change? Either way, it’s still my favorite light by far.