Meanwhile I have also received my SP40. It's nice of Sofirn to include the 18350 battery tube. However, I also asked Sofirn to forward some suggestions to improve the UI, e.g. a hidden moonlight mode (long press from OFF) as well as a better configuration for the indicator LED. As far as I was told, they will forward my feedback to Barry.
I didn't catch that, but yes. It looks like a thermal throttle at first, but I can't figure out why the output continues dropping past 300 lumens. I'd expect the battery, at 3500mAh, to last longer on high. Maybe not, though.
Do we have to ask gchart for a temperature vs. voltage vs. output runtime graph now? })
Yes, and bypass the springs if possible.
The driver may see a lower voltage drop that way.
On high, it shouldn’t be a problem, but on turbo with active cooling(running), should help.
That’s a bit much (I didn’t measure voltage), but here’s what I’ve got. Realistically, Turbo and High are the same thing except for the first few minutes, you get an extra burst in Turbo.
I haven’t done a disassembly yet, but it sounds like that might be in order. I’m curious as to what kind of driver this is using (linear, buck, or current-limiting resistor). Based on those curves, I’m almost wondering if it’s just a current-limiting resistor. :question:
Thank you very much. Very useful information! I think the Sofirn SP40 really needs a 300Lm mode. The temperature of the flashlight housing at 300Lm is quite comfortable.
But they already have XP-L drivers in a wide array of products . I guess BOM is more relevant, though I question whether this choice could save more than $1 per unit. It seems silly to make this trade-off, but it would help explain why the price is so low.
gchart’s SP40 charts make this light look less desirable, but not worthless. The overall runtime is okay if you don’t mind the constant fall-off.
Here’s one he made for the SP32A v2, which uses the XP-L2: