Just curious - your 219b sw35 is R9050? The one I got from Emisar seems to be R9080 https://intl-outdoor.com/emisar-d4v2-high-power-led-flashlight.html .
Yeah, just double-checked. Got it slightly wrong. It’s R9050 sw30. Bought a few from “trailhunter” back in 2019.
Per Simon it appears the shortage of S21D is related to availability of the new driver option. Yep new OPTION. Whereas the original S21D has 8A Buck driver, the next batch of S21D will have new 12A FET driver.
The puzzle is that the old 8A Buck driver will also be available after that next batch with 12A FET.
I quoted my temperature observation above because during my comparison with Emisar D4V2 with max thermal limit reset to 55 C, the S21D with 8A Buck driver was one, among the most toasty of all my lights, and two, maintained excellent brightness during the run down from Turbo, much better than D4V2.
It would be interesting to see how the FET version compares. Personally until some reviewer could do a run time comparison, I would be tempted to wait for the Buck driver version because it maintains brightness so well but of course that means you’ll have to wait.
Interesting. I would be curious what the specs are on that buck driver.
Great - built-in battery level indicator. :+1: 
I’ve just looked at the page myself - below 3V the switch draws less current and becomes dimmer.
Great battery indicator indeed. Starting at 4.2V, I can tell with remarkable accuracy, just from the switch, when the batt drops below 4.0V and 3.7V.
will the new driver cost more?
No announcement of any price change. From what I’ve read if anything a FET driver tends to be less expensive than Buck drivers.
The message I seem to be getting from Simon (he likes to answer my complex question with a short phrase ) is that if you don’t have any problem with the present Buck driver light, don’t worry about changing the driver.
The saga continues - the on again off again availability of Opple Light Master Pro. For what seemed like an eternity the “Pro” version was not available anywhere, but now seems to be on Aliexpress. Waiting for a bigger sale is too painful so I bought it right away.
Fingers crossed that there’s no shenanigans and it’s the Pro and NOT the cheaper Series 2 that they will send me, but this is THE legit official store and it seems the item is already at transport hub so should be ok. If you’d like to get one, just make sure it’s the item on the right side (in the red square), where under “Color” it will say Pro (please don’t ask me why it’s under “Color” lol ). The other way to tell is of course the Pro is more expensive.
If you have multiple Nichia’s, this of course makes the hobby even more fun, but should be educational to check & compare CRI and DUV of all the light bulbs in the house, etc. also. It’s not going to be super accurate like the $600 meter that Simon uses, but like my usual motto for Convoy lights, at 40 bucks I’m not complaining 
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https://www.aliexpress.com/item/3256803116495145.html?spm=a2g0o.order_list.0.0.4f2f18026hLcUc
Hey guys the S21D with the new FET drivers are LIVE NOW.
I’m debating to grab one now or wait for the 8A version, I typically run the 3rd setting brightness and I really like it
What are the specs for this?
Optic options also available - if you order the light now, ask for an extra one, he might just include it for free. The one I have is 60 degree, very nicely floody if that’s what you want. The next step down is the 30 dgree, which would be what I’d be interested in (I already am using Sofirn IF25a’s more throwy optic in my Convoy S21D and like this combination very much.).
https://www.aliexpress.com/item/3256803779702270.html?gatewayAdapt=4itemAdapt
Since I only use the light for low - medium levels, would it be best to get the 8A driver instead of the FET 12 since I won’t utilize the boost driver?
Will the 12A driver still be ok to use for low - medium levels or it wouldn’t be optimized as the 8A?
I am absolutely/unequivocally :innocent: no expert when it comes to drivers (whether buck, boost, linear, direct drive), just want to report my experience with the 8A Buck driver, and even that is seat of the pants type report: it gets hotter than other lights (measured with IR gun it was 59 C, versus my other lights’ 45 C or less), but it stays bright longer with les step-downs than for example same 219b 4500k LED in Emisar D4V2 with max thermal limit reset to 55 C. Basically I like/love the S21D with 8A Buck driver and have no problem with it.
From what I could read, FET driver is not as efficient (more heat) and use PWM to regulate output. Neither characteristic would be considered advantageous. Any expert please correct me or expand discussion as needed.
It puzzles me that as best I could understand Simon, the 8A Buck driver “supposedly” will become available AFTER this batch of 12 A FET driver. And… BOTH drivers are considered “options,” which is odd to me. So sorry there are more questions than answer. But… if it were me, I would be tempted to PM Simon and ask if he could sell you a light with 8A Buck driver, and if not, when one would become available. Please post what you find. All IMHO anyone pls correct me as needed.
FWIW from Aliexpress web site:
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https://www.aliexpress.com/item/3256803593026491.html?spm=a2g0o.productlist.0.0.617f56fccm2YK8&algo_pvid=9f0cdbcb-813b-4257-8a45-f04709c4dfee&algo_exp_id=9f0cdbcb-813b-4257-8a45-f04709c4dfee-2&pdp_ext_f={"sku_id"%3A"12000029191064981"}&pdp_npi=2%40dis!USD!!30.96!30.96!!!!%402101e9d216560977625024165ec06f!12000029191064981!sea
12A FET driver, max output 12A, It is greatly affected by the battery voltage and internal resistance, and the current drops rapidly.
8A CC driver, constant current buck driver, As long as the battery voltage is greater than the LED VF value, the driver still maintains a high current output. In addition, the new 8A driver uses springs instead of copper posts.
Bead TIR lens makes the light much softer, The larger the angle of the lens, the more scattered the light.
Simon said 20 days for the 8A Buck drivers to be restocked and they will come with springs instead of the copper rod for the battery
It appears that Convoy does offer the S21D with sw35 D200 L2R 9080 LEDs. Agreed, it’s a terrific LED!
Only 20 days? All things considered if it were me I would wait for the Buck driver version.
Agreed. For the 219b, I think a longer constant 2A per diode is much preferable to a more transitory 3A (with hardly noticeable increase in lumens and associated increase in heat).
Of course, this is all hypothetical for me based on my limited understanding of how these two drivers operate. It would be great to see runtime/lumens graph for both configurations.
would you say the 519a 4500k de-domed is the rosiest CCT?