From my experience with testing sbt90.2 lights this is pretty common. If it can do 1750 Lumens sustained, that’s not bad. Depending on the amount of thermal mass and the ATR algorithm/limit, the step downs are pretty quick and the regulated output isn’t good anyway unless it’s a buck driver like the Amutorch DM90/DM90S, Acebeam K75, etc. use. This light doesn’t have a lot of thermal mass (most of that 1 kg is in the battery…it’s 430 grams) and probably uses an unregulated FET driver, so don’t expect good sustained output. This is even worse for lights with unregulated drivers running Anduril.
No, this flashlight is supposed to have a buck boost driver. We see from the chart that this is probably true.
The problem is that the temperature limit may be set too low or the driver may not be efficient enough.
It’s a big flashlight, big enough to stabilize more. 1500lm would be ok. My X9L lumintop can sustain 800-1000 lm…
I highly doubt it’s a buck boost design. Maybe a Fet+buck driver, but this is not common from Astrolux/Mateminco. For this one I’d be happy with 1750 Lumens sustained as long as the ATR keeps it hand friendly. Testing will prove that or refute it. Historically, Sbt90.2 doesn’t lend itself to efficiency…low vF and thermal resistance draws as much current as it can take or the power source can provide.
Sorry, you’re right. I meant buck + fet. SBT90.2 is not very efficient, but the driver makes a big difference.
Let’s look at other flashlights with SBT90.2:
Acebeam K30-GT stabilizes 2360 lm in turbo, 2000 lm in high.
Fireflies T9R (which I have) stabilizes 1200 lm.
I hope that there will be other measurements, but this one is not very optimistic.
I agree, today SkyLumen has it, tomorrow they dont. This battery needs to be readily available and the fact that astroplex does not offer it is disturbing.
The other issue I see is getting spacers or different length tubes cut, 4680, 4695, 46110, and 46120 so far. Not really far off from 18350, 18500 and 18650’s or 26350, 26500, 26650, 26800. I’m using 4695 and 46110 cells so far, these cells are rated for 2000 cycles so wearing them out is going to take awhile. On a single charge I used a 46110 cell in the Lumintop 4695 light as a power bank and recharged my cell phone for a full month before it needed recharging. Several lengths, several sources these cells could be the start of something really nice.
Lumintop 4695 has a built in charger. You can also use the Olight universal magnetic charger, at 0.76 amps it’ll take some time. It looks like all of these lights are going to have a built in charger until it’s a bit more mainstream. Then again it’s also that port that makes it a power bank.
