This test really shows the value of using one’s hand as a heat sink.
It looks like you set the temperature ceiling to 35, yes? The units are approximately in Celsius, though they vary significantly from one MCU to the next. Regardless, 35 is pretty low. I’m not surprised it ramped down farther than necessary with a low target level and no cooling.
Yeah, a bit annoyed at that, I was playing around with it yesterday and must have left it at that low level, didn’t check the temp setting until afterwards. Still, gives an indication. 3 blinks then 5, 35 :+1:
FWIW, the default temperature limit is 45, and the maximum is 70. It has no minimum, but if you set it below room temperature it’ll step down to the lowest allowed level and stay there.
If you try to set it to a temperature below 0, I think it may interpret that as 255, then save a value of 70 to eeprom. And if you actually manage to save a value higher than 70 to eeprom, it’ll set that back to 45 when the light boots.
The tempcheck mode reads 0 for any temperatures below 0. At one point, it’d wrap around and give below-freezing readings like 252 degrees (25 blinks, pause, 2 blinks), but I fixed that.
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.