29

Wurkkos HD12? Just ‘tested’ the runtime on Turbo with Vapecell F15 battery.

After 2 min Turbo (perhaps ~800 lm), it steps down to High (some 300 lm, decreasing slowly to maybe 200 over an hour, which is flat enough), then drops to some 50 lm and gets dimmer slowly for the next 6 hours down to Moon-ish - all useful light - until LVP at 2.6 V turns it off.

For comparison, Convoy T6 SFT25R 5000 K with Vapecell H10 does turbo for a minute or so at maybe close to 1500 lm, then steps down to about constant ⅓ of it for 40 min, when it starts blinking and shuts itself off at 45 min, at 2.8 V.

HD12 got bad press on account of the 14500 driver reportedly being the brute-tish FET/PWM variety. It could theoretically be made a little more efficient, but practically it seems to work very well and inspires confidence that the light will not deprive me of at least some lighting when I least expect it. That’s even more important for a headlamp, I think.

I’m about to swap white emitters to 519a 5000 K. I wonder how that would affect how the LED/driver combination will work. Not sure what the original LEDs (Luminpower, some 3535 higher CRI variety?) or if their Vf/current ratios are much different at the voltages that the HD12 driver provides (with F15 battery).

1 Thank