I was wondering if anyone had some direct comparisons of 219B vs 519A, particularly dedomed 519A, in similar color temps?
For example, a dedomed 5700K 519A vs a 219B in 4000K or 4500K? Interested especially in measurements, but beamshots are welcome too.
Basically I’m wondering: what advantage, if any, does 519A offer over 219B? The sw45k tint and cri are fantastic. Domed 519A is pretty clear: higher output and current handling, higher duv, and less throw.
Dedoming increases throw, and lowers duv, but cuts output. Does 519A still have a significant edge in output after dedoming? How does the duv/throw compare after?
Since I am not a Turbo or High Lumen user, I continue to prefer the sw45k over any version of 519a.
otoh, for some reflectors, that come with large die LEDs such as the Sunwayman V11r w XM-L2, the small sw45k die produces a shadow ring in the spill, as does the dedomed 519a. In which case I use Domed 519a instead. https://i.imgur.com/imP2YJp.png
I only have one thing to add to what Jon posted. I just received a Emisar D4SV2 with DeDomed 5700k 519A emitters. Using my Opple, I’m getting 4050K to 4300K CCT depending on the power output. At the bottom of the ramp it is a warmer 4050K and as I ramp it brighter the CCT gets up to around 4300K. As Jon stated, the DUV is a bit lower than my SW45K’s as well (more rosey). With the TIR on the D4SV2 it has a very smooth beam with no rings. I have to find a place to take beamshots.
I’ve run mine at 3A without issues, but I know they are fragile. I also seem to recall 3A vs 2A not giving nearly as much benefit as in other emitters, but I’m not 100% sure on that one.
I have all the CCT 519As dedomed (and several domed) and 219Bs in flashlights.
The 219Bs are certainly very nice, but overall I prefer the dedomed 519As. The 219Bs are mostly on the slightly rosy side, with the sw45k being unusually rosy, but I prefer the extra rosiness of the dedomed 519As. Especially with the lower CCTs. With the 219Bs, whites look a little yellow, but with the dedomed 519As, the whites look whiter and the grays look less dull.
And you have to be careful with which 219Bs you get. The higher the bin, the less rosy they will be. For example, the Kaidomain 219B 3500K is a D240 bin which will be less rosy (or maybe not rosy at all) than the D200 bin that you can from Simon.
When Simon started selling green coated AR lenses, I installed them in many of my 219B flashlights which slightly and pleasantly improved the tint.
Most of my flashlights are triples though. When it comes to single LED reflector flashlights, I think the 219B is better than a dedomed 519A. Even though the dedomed 519A will have more throw, it also comes with more artifacts. The 219B seems to be one of the better LEDs for good beams.
But, ever since I’ve created my collection of dedomed 519As flashlights, rarely do I now use my 219B flashlights. To me, the 519A LEDs have been a game changer. Lots of lumens and high CRI. And you can choose neutral to rosy tints by leaving the domes as is, slice them, or dedome them.
I agree a dedomed 519a 4500K is more rosy than a 3500K 219b. But that’s not saying much, the sw35 is notoriously UnPink to begin with…
also agree the dedomed 519a does not have as clean a hotspot as 219b. ime the 519a only has slightly higher output, not enough to get me excited… Im not a high output user… I like low to medium modes and almost never use high modes
I tried a bunch of 519a, the keeper for me was the 5700K domed 519a.
at other times I still prefer the sw45k and the sw30 over the 519a options including dedomed 5700K and dedomed 4500K
to me the tint of the 519a tends to be more orange ochre than pink,
I still prefer to use my sw45k over any 519a I have tried. I just love pink tint the most…
Down with the UnPink! Purge it! Purge it with fire!
…
*ahem*
Sorry, wrong button. I’m getting over a cold.
*cough*
Anyway. I was wondering too, about 519A 5700K dedomed vs 219B sw45k. I’ve often wanted something like a “sw42k” or similar, like the sw45k but slightly warmer, but it doesn’t seem to exist… So I think sometime I’ll have to try a 519A minus the dome. It sounds like it hits approximately that part of the spectrum.
OTOH, I know sw45k is good. But I don’t know the 519A yet, and I’m worried that it might just be another disappointment.
FBsLights excellent diagram of sliced 519a with different hights
(btw. the jump of the BBL at 5000K is because up to 5000K it is a pure black body line and above 5000K it incorporates the filter effects of earth atmosphere → it jumps up a bit)
Down with the UnPink! Purge it! Purge it with fire! 
