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)

Simon, what is the ETA on the 8A Buck drivers.

that is a Huuge difference!

before seeing that 0.0128 difference in duv, Ive assumed there is about 0.0030 discrepancy in my Opple, compared to a real spectrometer.

in this case I think Simon got an unusually high duvā€¦

bottom like is we cannot really expect a match, using different tools and non identical LEDs

the best use of Opple imo is to compare lights I own, side by side
.

Jon, very good points to keep in mind (comparison more valid when not compared across different test devices, brightness, LED batch, etc.). That way we could stay relaxed and have fun while learning something.

Iā€™m sure youā€™ve noticed there are 3 zeroā€™s in front of Simonā€™s value. So his number hugs the BBL very close, maybe not a ā€œhugeā€ difference from my 20% brightness value. ie Simonā€™s ~ .001 (round up from the seemingly large 0.0009) versus my .002, and your.000.

> Iā€™m sure youā€™ve noticed there are 3 zeroā€™s in front of Simonā€™s value.

no, I missed that, thanks, so 0.0009, thats very reasonably similar to 519a 4500K Ive measured too

here is one 519a 4500K test at duv ā€“0.0003
.

S21D 8A Buck In Stock!!!

Finally. Good catch :+1: :slight_smile: .

(Click the ā€œ8A CCā€ of course.)

Iā€™m still debating to get my 1st Hank Light. The S21D is so good but Iā€™m looking for a more portable quad LED setup lol

Yes there is something about a small light that fits completely in your palm with side switch. It feels right/very good. And D4V2 is very pretty.
I couldnā€™t decide between Hankā€™s and Simonā€™s lights so I got both.
:confounded: :smiley:

If you do get Emisar D4V2, I would add a couple comments: I do NOT like the option of raised ring around button (takes away from the smooth feel), and if you get brass or copper option, they are extremely pretty, but also very heavy.

Out of curiosity, what does this mean in laymanā€™s terms? I already have the 12A version, so Iā€™m wondering what changes if you get the 8A. Differences in output or runtime?

The 8A version is more efficient, and is this likely to result in higher sustained brightness, and longer, but not quite as bright turbo.
Iā€™ve just ordered the 8A CC 60 degree 519A 5700k version.

Anyone have beam shots of the various reflector/TIR angles offered?

When/if you order this light, maybe ask for extra lens(es). Iā€™m just guessing here but Simon might give it for a very, very, very low cost. Almost the same as free. :innocent:

So my S21D 519a sm453 is coming home this week. Should I de-dome it? I heard it wonā€™t be as floody :frowning:

But I do like the rosy tint

If anyone is interested, this is what the 12A driver looks like.
I donā€™t see any current limitation, so I donā€™t understand why itā€™s labelled as 12A. It is a fully direct drive driver. I donā€™t like this topology, I certainly wouldnā€™t have chosen it, I got the lamp as a gift.
It is also interesting that the price is the same as the much more complex 8A version. At low levels it has much worse efficiency than even FET+1 (7135) drivers.

Edit: I was thoughtless, Y2 is just a PNP the other half of the transistor pair controlling the FET.
This stuff rivals the drivers from Boruit and similar manufacturers. Of course, at least this one has thermal protection. This is not what I expected from Convoy :cry: .

Thanks for the info. There is something unusual about this situation for sure. First 8A Buck became un-available, replaced by 12A FET for just a few weeks, then 8A Buck became available again, together with FET, both as ā€œoptionsā€ (?!).

I wonder the brief absence of the Buck driver is related to supply-chain problem as a result of the many lock-downs in China a couple months ago.

At least whatever problem there was, seems to have been solved. 8A Buck should remain the one to have.

I remember reading there was some compatibility problem with 8A buck and very low VF of Nichia 519A. His driver engineer needed to fix that. 12A fet driver was just higher output option for it.

You know whats funny? I just bought a S21D and asked Simon about the metal waist clip. He said not to buy it because it doesnā€™t fit. Hmm. Iā€™ll just have to buy another light and buy two clips. Oh well.

I think thatā€™s what he told me too, but some member here told me to try and I took a chance and bought it, and it fits perfectly.
I believe heā€™s being cautious because it is not made specifically for S21D, but took me 5 minutes to install and the fit is perfect. BTW I installed with the switch buttons removed and that helped a lot.

This is the clip I bought. I think I got the 5 pack for about 6 bucks, inexpensive enough to take a chance: Page Not Found - Aliexpress.com

And this is how it fits. Hope this helps.
(BTW the post you quoted above had been posted before I found out and bought these metal clips).

It looks really awesome. Iā€™ll have to order separately now. Maybe with a lighted switch as well! Thanks.

Just received the S21D with 519a and 10 degree optic. Although I do like the light, the 10 degree part is misleading. I was expecting some hot spot but instead the light spreads more like 180 degrees. I can only imagine how the 60 degree is. Anyone else have this observation?