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.
Iām sure youāve noticed there are 3 zeroās in front of Simonās value. So his number hugs the BBL very close, maybe not a āhugeā difference from my 20% brightness value. ie Simonās ~ .001 (round up from the seemingly large 0.0009) versus my .002, and your.000.
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 couldnāt decide between Hankās and Simonās lights so I got both.
:confounded:
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 laymanās terms? I already have the 12A version, so Iām 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.
Iāve just ordered the 8A CC 60 degree 519A 5700k version.
When/if you order this light, maybe ask for extra lens(es). Iām just guessing here but Simon might give it for a very, very, very low cost. Almost the same as free. :innocent:
If anyone is interested, this is what the 12A driver looks like.
I donāt see any current limitation, so I donāt understand why itās labelled as 12A. It is a fully direct drive driver. I donāt like this topology, I certainly wouldnāt 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 .
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 āoptionsā (?!).
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 doesnāt fit. Hmm. Iāll just have to buy another light and buy two clips. Oh well.
I think thatās 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 heās 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).
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?