Hey I just noticed something with my SC31Pro. The brightness of the button lights changes as you ramp up, two levels. Is this regulated vs non-regulated? I haven’t been able to find info on this feature.
The brightness changes when switching to the low amp channel to the high amp channel. On the SC31 Pro, it's a FET+1, meaning a FET channel for high amps, and a single 7135 amp limiter for the low amp channel. Think I posted this pic earlier:
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The chip on the vertical board is the 7135 amp limiter, limiting amps to 0.35. So when you ramp up, under 0.35, the button light is lower, than above 0.35 amps, it's brighter.
It's a feature of Anduril. I think in NarsilM, I blinked the switch LED at the point of transition.
Must be a relatively new feature. I checked my two Anduril Fireflies lights and they do not do this. Nice. Now it’s easy to keep in regulation. Thanks Tom.
That is so cool, amazing how bright it is even at .35 amps.
Thanks for the info.
Huh I had no idea, thanks for the info!
I like how the button doesn't activate easily as I carry it throughout the day in my front pocket. It's turned away from the back or front pocket wall.
I believe this has been in Anduril for quite some time already, but maybe the button switch has to support it.
In particular, I remember seeing this behavior when I reflashed my early BLF Q8 into Anduril (has to be sometime early 2019 — so the Anduril back then likely already had this ‘feature’) and notice the button brightness changes once it crosses over a certain level (most likely the FET+1 threshold).
It's a compile time option, so some have turned off the feature in their Anduril build. This is why TK always emphasis's that the manufacturers provide a direct link to the code they actually used to create the build, and none of them do, that I could see. They may have a link to the repository but that doesn't tell me what build options or compile switches were used.
Y’all should know you made me buy yet another flashlight I didn’t need! 
Nice to see ya still busy Tom, glad you’re all right in all the craziness.
This will be a nice light for standby, or gifting. The built in charger and included cell make it a great starter light for someone that isn’t already addicted. (;
I like that remark about swapping the emitter “how hard can it be?” Cracked me up at the innocuous innocence! Seems I once said something along those lines, ended up costing me a small fortune! LOL
Stacking a 7135 chip can double the power capability of the low channel… just saying. 
Hah Dale! Yep, I've been surviving. Still working on the same consulting gig but cut to 32 hrs/week billable - company got bought out, ~25% layoff, might be more, plus unknown future.
The SST-40's seem to be look'n better lately - think the CW's are at the lower range now, like 5700K-6000K, but still really like the 5000K.
If adding a 7135, yep - quite do-able. Not sure how much it effects the smooth ramping, may not be much, but if it does and it bothers you, might have to re-do the ramping table.
I got some SST-40’s at 4750 and only used a couple of em. Have ton of stuff not being used, even a 90.2. Even gave a 90.2 to a buddy that has yet to put it in a light.
I have 9 of the 40’s in 4750 that I got from Simon 10.24.19. Apparently only used one in a D80.
Hi everyone,
I’m new to flashlight. My SC31 Pro has the second ring in the beam shot. Is it normal or defective?
What do you mean second ring? Can you post a picture? I’m guessing it’s just the way the reflector is configured (kinda trow/flood balanced)…
Our flashlight has SST20 2700K
Are you talking about the thin ring on the outside of the spill? The way mine looks is that it has a spot in the center, then an area of spill, and outside the spill is another, slightly brighter ring that encircles the spill. If that’s what yours does too, then I would say it’s normal, as mine is that way too.
Same. The beam mostly looks ok. If I shine it on a wall one metre away, it will have a hotspot, a fair amount of spill, a dark circle a few inches thick, and a thin brighter circle similar to the outer spill brightness.
Others have commented about the ring they're seeing, which matches what I see in this image from the 5000K version I just got today. Is the outer ring the one you're referring to?
Mine does this as well. Think it is mentioned in a review somewhere. Has to do with the reflector and the part of the head that holds the lens. Normal.