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.