Convoy S21D w/ legendary Nichia 219b :) - Review & comparison w/ Nichia 519a, E21a & other lights with Nichia LEDs incl. Emisar D4V2, Convoy S21F. (Summary & measurements on P. 1)

2puttbirdies · January 12, 2023, 2:34pm

I can confirm the 519a 5000k from Simon has no green at all - it is really, really good.

cannga · January 12, 2023, 9:14pm

QReciprocity42:

Thanks for linking the other thread! I noticed that the TS32 has purple AR lens, which can alter tint significantly, up to 0.003. That might be the reason things look extra green. When I swapped a purple lens from an S2 triple to a clear/uncoated one, it was a game changer.

Those are interesting graphs. If I’m reading correctly, it’s saying that at 5700K, increasing current increases CCT while almost fixing duv, and increasing temperature lowers duv while almost preserving CCT. Very interesting. My first thought would be that the phosphor becomes saturated at high currents and lets through more blue, but in that case CCT and duv should change simultaneously. Another guess is that different colored phosphor particles have different efficiency vs current/temp profiles.

Thanks. I like to confirm with you first so I could make notation on the graph and not make a fool out of myself :+1: .

First curve - slightly down sloping horizontal curve going right to left means increasing brightness leads to increase in CCT; Duv very slight change. If BBL is starting to bend downward at this CCT point, the Duv may not change since it is relative to BBL line. Now that I am aware of this trend, I see it a lot, for example in ALL the Chinese power leds I’m testing.

Second curve - straight drop with temp means “big” negative Duv change as LED heats up. Slight change in CCT since isotherm line is tilted. I see this the most with my 519a. Also 219b but not as much.

Thanks very helpful. I would go for this then. My 519a 4500k from Simon measures 4000k and is a little too yellow for my taste.

cannga · January 13, 2023, 3:49am

@snfx, I asked Simon on AliX and oddly this was the exchange. I’m asking him to clarify and if that’s the case I’m out; don’t like mixed CCT and don’t like either of the 2 CCT’s used in the mix. 2700k is too warm and 5700k is too cold for my taste.
*
Me: Hi Simon, I will buy new S21F with 519a 5000k as soon as you put up the link. Would you please tell me Duv and CCT of your 519a 5000k? It’s not too green?

Simon: This is a flashlight with adjustable color temperature. 2700K to 5700K

Me: I thought S21F is the new S21D with USB charging and choice of 219b or 519a? That’s not correct?

Simon: 2*519A 2700K and 2*519A 5700K,
it’s not greenish

Erion929 · January 13, 2023, 4:01am

Well, that’s a different story. So, you can run 2700k on just 2 emitters……or 4200k on all 4 emitters….or 5700k on 2 emitters? Is that how it works?

.

cannga · January 13, 2023, 4:30am

Erion929:

cannga:

@snfx, I asked Simon on AliX and oddly this was the exchange. I’m asking him to clarify and if that’s the case I’m out; don’t like mixed CCT and don’t like either of the 2 CCT’s used in the mix. 2700k is too warm and 5700k is too cold for my taste.

Me: Hi Simon, I will buy new S21F with 519a 5000k as soon as you put up the link. Would you please tell me Duv and CCT of your 519a 5000k? It’s not too green?

Simon: This is a flashlight with adjustable color temperature. 2700K to 5700K

Me: I thought S21F is the new S21D with USB charging and choice of 219b or 519a? That’s not correct?

Simon: 2*519A 2700K and 2*519A 5700K,
it’s not greenish

Well, that’s a different story. So, you can run 2700k on just 2 emitters……or 4200k on all 4 emitters….or 5700k on 2 emitters? Is that how it works?

.

Not an expert (meaning anyone please correct as needed) but AFAIK you draw a straight line between the 2 LED’s and your resulting mixed CCT and Duv is around midpoint of the line. Since BBL is a curve the resulting mix will have lower Duv (more rosiness, like 219b) than either of the 2 LED’s you started with. The further apart the 2 CCT’s, the more the Duv drop (make sense if you look at the curve). That’s why Simon picks those 2 CCT’s that are far apart.

When I buy a 519a light, I actually am interested in 519a’s more neutral Duv’s beam color (less rosiness), so this mixing is not what I like. But that’s strictly personal preference. I might just buy it out of curiosity though .

merlot · January 13, 2023, 12:04pm

I’m very curious to see this S21F, it sounds like it could be a good competitor to the d4v2/d4k. Are there any photos of it? Or more information about the driver/UI etc?

Azirine · January 14, 2023, 4:45pm

Is it possible to dedome the S21D 519A without desoldering?

snfx · January 14, 2023, 10:11pm

wait what the, the new S21F will be dual-channel tint ramp?

snfx · January 14, 2023, 10:12pm

Yes, unscrew the top and use the q-tip method. Check out youtube for a better guide. I did this for my S21D 4500k and it came out good!

Azirine · January 14, 2023, 10:29pm

What is the q-tip method? Can you provide a link to the video?

snfx · January 14, 2023, 10:42pm

go to the 5:42 minute mark

cannga · January 15, 2023, 12:30am

Lol I know. I’m asking him to clarify. Very odd if that’s the only choice available.

snfx · January 15, 2023, 12:49am

cannga:

snfx:

cannga:

@snfx, I asked Simon on AliX and oddly this was the exchange. I’m asking him to clarify and if that’s the case I’m out; don’t like mixed CCT and don’t like either of the 2 CCT’s used in the mix. 2700k is too warm and 5700k is too cold for my taste.
*
Me: Hi Simon, I will buy new S21F with 519a 5000k as soon as you put up the link. Would you please tell me Duv and CCT of your 519a 5000k? It’s not too green?

Simon: This is a flashlight with adjustable color temperature. 2700K to 5700K

Me: I thought S21F is the new S21D with USB charging and choice of 219b or 519a? That’s not correct?

Simon: 2*519A 2700K and 2*519A 5700K,
it’s not greenish

wait what the, the new S21F will be dual-channel tint ramp?

Lol I know. I’m asking him to clarify. Very odd if that’s the only choice available.

Wow, that’s interesting! Not sure how I feel about this lol

I’ll ask for a price tag.

snfx · January 15, 2023, 8:35am

GUYS THE LISTING IS LIVE

https://www.aliexpress.us/item/3256804957386368.html?pdp_npi=2%40dis!USD!US%20%2431.88!US%20%2431.88!!!!!%402101f49b16737716355266028e956c!12000031838238349!sh01&spm=a2g0o.store_pc_home.productList_2004489042405.subject_0&gatewayAdapt=glo2usa&\_randl_shipto=US

$31.88

ONLY 20 PIECES AVAILABLE

YOU HEARD IT HERE FIRST!!!

cannga · January 15, 2023, 9:36am

Wait what happened to Simon’s website notice? “The Chinese New Year is coming, and the flashlights in the store will be suspended from January 9th to January 29th. But the accessories will be on sale.”

Kidding aside, thanks I’m in.

snfx · January 15, 2023, 9:38am

So far 2 orders, you & me!

Flashlight addicts LOL

jp9mm · January 15, 2023, 4:26pm

This new one is tempting but im not sure i will like the tint ramping.
Considering just going with the s21d for a few dollars more to get all 519 in 5k
I don’t have any convoys yet but im trying to decide on 2 or 3 to check out. Im pretty set on a m21d-70.3 5k, maybe this s21d and a l21a
Currently on a flashlight binge so i’m a little crazy atm.

Erion929 · January 15, 2023, 4:27pm

This 21F does NOT have the 8A buck driver of the 21D?

.

cannga · January 15, 2023, 5:53pm

I am asking Simon whether there’s plan for fixed CCT options with 219b and 519a. And the driver.

UI and button seem identical to my M21F and E. Size similar to S21D. Seems like no hole for screw-on clip, but Convoy clip on clip should work.

Light has 60 degree TIR - maybe to reduce artifact?

cannga · January 15, 2023, 6:00pm

First 2 in line. I hope we won’t be smoke detector (aka B35AM at 3A) :confounded: .

Outside of market demand, is there a reason Simon decides to start with this instead of fixed CCT? Does it look that good? We will find out soon enough.