Thanks Dale. I've done that technique with loosening/tightening the bezel to adjust, and I tried it, but didn't get any noticeable effect with the M12. I haven't done tweaking on a true thrower with de-domed LED's in quite a while, and did only one recent XPL HI in an X6, I've being doing more small lights for general use (w/domes), or multi-LED lights. Actually I've been frustrated with de-domed throwers in the past and is the main reason I've stopped, plus with these new XM-L2's that can't get high amps, every time you do a thrower, you roll the dice, more so now than before.
The M12 has the reflector type with the big flat backside, and using the 26 mm MCPCB and 20 AWG wire, and the fact you have to work with the iron on the MCPCB down into the head, it's not a good setup to easily get the LED into the reflector more. That's where the M24 will have some advantages because with a buck driver, you don't need such heavy wires, and they may have more options.
Those are real good points bout the black hole - I do notice at 5m there seems to be a hotter spot in the center beam, and that's what I used to get the 205 kcd reading. I just think it's out of focus mainly because the center beam isn't crisply defined - fuzzy edges. Now I really dunno for sure - I'm not confident at all in my ability to judge this stuff, and also inexperienced with the XPL HI.
Another weird thing is the max I could get (measure) was 4.5A at the tail, and actually I got higher output using a 26700 cell. It's behaving like there's not good contact for the cell. The M12 is a bit unusual:
- it doesn't use a driver spring, rather a brass button, but I soldered the button to the driver in my earlier modding of the light
- it's designed to unscrew the body at the batt+ side, not the tailcap end, making it more difficult to get a good tail amp reading
- it seems designed to handle the longer 26700 cell, so high powered 18650's are loose and rattle, and behave like they are losing some power
- I tried an HG2 cell with 2 magnets on the batt- end, and it did a little worse than the 26700.
Also, I measured the 205 kcd with using the 26700, and I also measured lumens with the same cell, and got this:
- lumens: 1214 @start, 1193 @30 secs
So, there's something probably wrong there because the BLF X6 I did with the same XPL HI I got: 5.1A, and 1600 @start, 1500 @30 secs.
I wouldn't think 5.1A to 4.5A would drop this much lumens, but maybe. For this M12, I think I should get rid of the brass button on the driver contact and replace it with a good bypass'd spring - that should help with the battery issues I'm thinking. The FET driver is the older style BLF version with the original good Vishay 70N02 FET.
I really do like this 2B tint in a thrower - looks very white to me: no blues.
The good thing for the M24 potential is my throw # is probably lower - depends on measuring technique and final actual amps to the LED.