+1.
BTW, am I the only one thinking about GT Nano? :smiling_imp:
As to the AMP limit, I guess we need some high power buck drivers to really get the most out of it. Lexel did some for SBT90.2 but even that is not powerful enough.
4S NiMH and low resistance or 2S LFP with higher resistance could be a low-tech way to get the amps
Because somebody told me he was working on a high CRI 3mm round LES 3V LED that can take up to 20A I looked at how to drive it with DC-DC converters from 1S or 2-4S, buck-boost should be possible up to 25A (as long as there is enough board space) , and buck up to 40A with the LM27403 from TI. I started looking at components to use but then he told me he abandoned because the high CRI phosphors cost way too much and so I lost interest.
Anyhow I think it’s doable to make a high power buck driver for these fat LEDs (after all Acebeam use buck drivers in their high power lights AFAIK), and if they were high CRI I would work on it.
LTO is around 2.2~2.3V nominal, closer than LFP in 2S, but it has pretty low capacity, can be severely abused though.
Than you for presenting your analysis of this exciting LED.
I can think of five dedicated thrower flashlights that I would like to have this LED in: Small-medium dedicated thrower, medium size, large-medium size, large and extremely large dedicated thrower.
Same thing with power throwers and power flooders, too. That's 15 new flashlights right there. But I would want Mateminco MT90 Plus SHF55, Lumintop BLF GT 4x SHF55, and Imalent MS18 SHF55, first, then all of the others.
Rich, I like the way you think! The MS18 with 18 of these monsters -- hhhmmmm. 
Lol. Speaking about this light, zeroair’s review shows it’s unregulated with what looks like PWM dimming. It seems like they are direct driving those XHP70.2, either 2S to 6V or 4S to 12V.
Lexel used multiple driver ICs in parallel to increase the max AMPs. He basically took one of his regular designs and multiplied components. And only in a later iteration he did some optimizations.
What’s the price of them compared to the SBT90.2? If it’s a lot cheaper then that could be a good reason for some people
Yep, LM3409, rated for 5A max but I think Lexel used it up to 8A , it’s a LED driver so it’s easy to implement compared to general purpose converters, the downside is that it’s asynchronous hence less efficient, and to reach high currents with multiple ones a lot of board space is needed.
Pure orgasm !!!
Info is sketchy - we don't know where to even buy them, but from the chart in the OP here, it implies the price is just under 1/3 the cost of a SBT90.2, speculating in the range of $10-$12.
Have you measured the output of the FW21 Pro XHP50.2 or E07 XPL HI/SST20? Wonder how it compares. It seems like this emitter would be a good alternative to 3x XHP50.2 but with increased throw.
This is a good point. In the example case of FW21 Pro 50.2, by going to a single emitter / reflector, you’d gain ~65% optic area. On an emitter surface area basis, this is about equivalent to three shaved 50.2s. ZeroAir reported ~9200 turn on lumens with a 30T. TomE states 9880lm turn on with a single 30T. So some napkin math, 1.07x for lumens, 2x for apparent emitter area (for domed 50.2s), and 1.65x for the single reflector… That’d be ~3.5x the candela with similar lumens. I like it.
I got #'s on a triple XHP50.2 modded Amutorch X9 - don't have a FW21 Pro, not a fan of any tail e-switch lights actually. I do have an E07, think SST-20's. I'll check the #'s.
How is the tint compared to the lights mentioned above? Is the hotspot cooler than the XPH50.2?
Not a huge fan of the tail e-switch either. I regret selling my E07…I do like some things about the FW21 pro but it has it flaws. It used to be about 30% brighter than my E07 at turn on but now it’s almost the same. Maybe I need a new battery? I also noticed that the turbo output can change just from loosening and re tightening the head. On the plus side I do prefer the more efficient LEDs and constant current driver, but then again, it lacks aux/switch LEDs and doesn’t have the best tint. I’d like to see a light the Size of the E07 but with this LED. Should be super bright but with decent throw.
I have a FW21 Pro and thinking of something like that the one that would be a good interesting beast is a Pioneer K36 with SFH55. What do you think?
Found where to buy the LED, Pioneman store on aliexpress sells it for $13 on a 24mm pcb. Might be interesting to put in a Convoy 3x21A with triple molicels, if the convoy driver can make use of it. Hopefully over 10000-11000 lumens if the tailsprings are bypassed.
Convoy sells a 28A driver and a 4x18a host
I would think that with the 4x18A you would be limited by the batteries. 4x P28A is a maximum capacity of 11.2Ah, 3x P42A or P45B is higher than that while having better high-current properties.
four times P26A gives you 11.2Ah and three times P45B gives you 13.5Ah.
So yes, in theory a bit more endurance
But also on paper the P26As can deliver 140A constantly and the P45Bs only 135A