Thanks, wasn’t sure if they were using the low quality springs to limit current.
It is okay to do, but it may not change anything in this particular driver design.
It seems the driver looks at resting battery voltage to determine whether to have Turbo or not. Voltage sag seems to not effect it. Quite strange.
Maybe a bypass will squeeze out a little more Turbo run time? I’m not sure. On other boost drivers, where the current goes up as voltage goes down, I always recommend bypasses. They make a bigger difference there. With this light, I’m not so sure.
Nice write up Jason, have you thought about slicing and dicing the 50.2 to get rid of the weird aura and tighten the beam?
With ANY current regulated driver it is better.
You lose less voltage when your electrical path is optimized.
No, I prefer the beam as is. The hotspot is already pretty small for my needs (walking around at night). I don’t want to go smaller. I’m not bothered by the corona. I think I’ve gotten used to it.
Well, it’s not as bad as the smaller Cree flip chip LEDs like the XP-G3 and the XP-L2, but i still don’t like it.
I’m gonna try a Nichia 144A in it, which is probably just as bad, but i found a suitable frosted TIR that will blend everything to perfection, or so i hope…
Gonna have to shorten the head though, because TIRs are short…
First i have to tidy the huge mess that has grown in the shed, though…
My v2 has a different tailspring than my original SP33. The old one was the full diameter of the tube. The new one is ~1/2 that. The length of the current path is shorter, as a result.
The point still stands about voltage drop, though.
Thank you all for answers. This is what i like about this forum, you ask something and you get a decent answer in no time! Thanks guys! That 26mm mcpcb would be great but i have never reflowed a led. Maybe i will try with 20mm XHP50.2.
The DQG 7x emitter 26650 definitely steps down. It’s actually very noticeable. Just try it. I wish Sofirn will get rid of the timed step downs on their newer lights that already have advance temperature regulation. I don’t want timed step downs especially when used in outdoor cold temperatures.
Driver pics are added to post 1.
Thanks for the driver photos!
It looks like it is using the TI TPS61088 boost converter.
Edit: And it looks like this is how an switch current limit is set.
There are other ways to do current limiting though, using an op-amp and the voltage feedback pin.
I have this light and for $20 it’s a bargain, 2400 real lumens and 1000 sustainable lumens, with great UI (click on click off)
The things I don’t like:
-Tint: it’s cool, a 5000k would be better
-Can’t go from moonlight to regular modes, you have to turn off the light and then turn on with a single click
-Can’t turn off from turbo, you need two clicks, first click gets you to previous mode and second click to turn off
Oh, i never noticed. I guess i only use turbo for short periods.
Trying it now.
Aha, yes it does step down after a minute or so.
Ooh, it’s hot !
But it doesn’t step down based on battery voltage or current or does it?
At least not as early as the SP33.
When you go to turbo from OFF it’s just one click to turn it off.
Awesome!
Thanks, Jason. :+1:
That’s very good to know !
Hopefully we can identify the resistor and replace it.
so who will slice the led? just ordered mine. usually shipping is pretty fast.
Switch mod.
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Placed my order from their Aliexpress store Nov 14.
Tracking shows light was shipped Nov 26.
No updates since then. 30 days later and it hasn’t left China yet.