is it possible with current driver configuration to blink and show battery voltage like when power is connected just like what Nitecore did with some of their lights?
You can check the battery voltage at any time by triple-clicking. It will blink first telling you the number of volts, then pause, then blink again for the number of 10ths of volts.
To put the efficacy in perspective, the Astrolux S41 (219B) gets about 60 lm/W on the ~100 lumen mode according to my old measurements with an 18350 Efest.
My unexpected Meteor measurement got me curious, so I ran some tests…
On turbo with full cells, it measured 4848 lm in my light box. Significantly less than the 7450 lm it’s rated at for XP-G2 3D emitters. Then I did a runtime test with it on turbo in cold water.
Afterward, I recharged the cells and ran the same test on my D4-219c. Would have used XP-G2, but that one is my dev host and is basically a floating head with the brains floating outside its body. So, 219c was a lot easier to test. I ramped it to 1212 lm in my light box (1/4 of the Meteor, since it has 1/4 the battery capacity), then put it in cold water and started the test. Well, as close to 1212 lm as I could get it quickly, but it was actually about 1250 lm.
Here are the two runtime graphs:
I didn’t let either one run long enough to shut off completely… just long enough for LVP to give a warning. After each test, the cells probably still had enough power to keep going for quite a while before the light would actually shut itself off.
Voltages:
M43: 4.17V start, 3.10V end
D4: 4.15V start, 3.17V end
Edit: I’ve been meaning to make a thing to combine graphs… so here are the two merged.
Note, this is nowhere near maximum power on the D4. It’s set to be 1/4 as bright as maximum power on my Meteor. It also isn’t directly comparable since they used different emitters. The Meteor’s XP-G2 emitters are significantly more efficient, and its driver should be too. But I hope this gives an idea of how the runtime graphs compare at a similar amount of lumens per cell.
I would like to show you that the triples and quads from Carclo have an element that is present on each optic as it seems some people are under the impression their optic has a defect, it is the way the optics are being manufactured. This can also be seen in the datasheet.
Doesn’t this depend on the output? The higher the output (you chose 370 lumens), the bigger the PWM contribution of the FET, so efficacy should go down further?