The S21A has a larger reflector so it's going to throw a little bit more. However, the SC31 Pro keeps up very nicely and performs as an EDC most spectacularly. I carry the Pro in the day (not that I have use for it in daylight) and the tint is the least blue of any I have in its tint range.
The camera doesn't pickup all the flood output that well.
Does anyone know if you can flash the earlier version SC31B driver with Anduril?
Not unless you did like I did and swap the driver.
I don't have pics but the 5000K SST-40 looks sooo much better than the CW 6500K's. The 500K is all white, while the 6500K's are noticeably blue, least to me.
Maybe I won the tint lottery, but my CW ’pro had a pretty decent CT/tint, not angry blue at all.
I'm happy with mine, too.
It could be from some fried-egginess of the beam from the reflector, but being that the spill is rather faint but blue, most of the yellower light hits the reflector and gets tossed out into the hotspot and/or corona. A hint of green at lower brightnesses, but nicely neutral at higher levels.
If I had to guess, I’d say the hotspot is in the mid-5000Ks.
Hey, I was all prepared to hold my nose when using it, expecting lots of blue, but it’s really quite nice.
Did you guys order the 5000K or 6500K? I'm confused. I have a few lights with SST-40's, so I'm speaking in general, but have compared the beams side by side of each tint.
Heres my sc31pro 6500k sst40 vs sc31b sst20 6500k
6500K.
Got my SC31PRO torn down right now so can't check. Could be this CW SST-40 Sofirn is using is better than the regular 6500K's.
The BLF D80V2 is the best SST-40 tint I've seen, it's rated at 4700K-5000K. I got 3 lights with 5000K and 3 with 6500K. The oldest 6500K LED I got in a modded BTU PK26 seems to be the blue-ist.
Thanks Tom E,
I picked up 4-5 of the SC31B’s from Amazon with the $9.95 coupons to use for easy LED swapping to test different light temperatures and also as simple UI give-a-way for friends.
But I’m finding that I personally really like the form factor and carry them with the 18350 tube as hard use beaters or leave them at different locations and and just not worry.
It would be interesting to swap in another driver and flash Anduril.
I built it up - PCB from OSHPark, reflowed, flashed with my tailored Anduril. Here's a pic of it installed, leaving the wires long enough to re-flash without any soldering. It's a 20 mm driver, FET+1, probably one of DEL's.
The driver doesn't accommodate a resistor for the AUX LED on pin #3, so had to tombstone a 6.8K:
The SC31B is an easy light to mod for a driver replacement, accept with this swap, you lose the charging.
Thanks Tom, that is a nice build and very interesting, excellent images. I will take a look around at some of the compatible 20mm drivers, possibly a winter project for me. I would want to keep the charging but could possibly lose the led if I flashed Anduril.
I may also contact Sofirn and ask to add a SC31pro driver to my next order. I think they will sell one for a reasonable price, I have ordered various parts for projects in the past and they have been very helpful.
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.