Very useful comparisons, but there is something to add, namely descriptions as to how you experience these various LEDs, in various situations. I mean the actual experience vs. pictures is not the same because we watch pictures on a web page (with more stuff on that page around that picture), in a room which has still more stuff that we can all see at the same time as that beamshot picture, such that actually what you show is not what you will experience when using it because our own white balance depends on the whole picture we see, so unless you watch in a dark room and only see the picture on the computer screen, what you see in reality is not what the picture shows. The more is on screen in the picture (the room) the better it is but it still won’t be the same so a description on whether “I get a pink feeling” experience occurs for example would be useful.
This is also a problem with beam patterns for cutoff lighting, actually even more so, which I analysed and explained on my website. I haven’t done this in in detail about the white balance, but I did mention on my site the issue with beam shots not showing what you experience due to perspective, the aim of your view (what you look at, and at what distance).
So various things that are obvious in your pictures may not be obvious in reality except in special circumstances. In your pictures the 219b shots I all see as pinkish, very unnatural, but perhaps in reality it works well in many situations, but not all situations! I ordered a D4V2 with 219b 4500K so I can try out different firmwares and try out these LEDs, will likely only arrive in a few weeks at best. I read comments that some people dislike the 219b in some situations, especially when there is snow, and that makes sense, it would give a pink glow then to what you see.
This is likely also my problem with the LH351D, in that the situation with lots of wood colours, things are off. I will do a beamshot session with the 219b 4500k, 219c 4000K, XML 4C, SST20 4000K and LH351D when the D4V2 arrives to see about the situations that I feel are problematic. I estimate that the SST20 4000K and 519A also ca. 4000K will be the best in giving good colours under all circumstances. I will try to get hold of some 519As in 4000K and 4500K…
Oh, something else, lit tail caps. According to Simon’s aliexpress pages of his lit tail caps, these take about 9-14 mA with a full battery, dropping off when the voltage drops. This would mean these suck an 18650 empty in a bit more than 10 days. That seems far too much (small LEDs don’t need so much power, e.g. you can run a 3mm standard LED that is rated to 20 mA at 1 mA and it will still be quite visible). In the thread “D.I.Y. Illuminated tailcap” a current is mentioned of 0.29mA, which is a lot better, that would take more than a year to drain an 18650 ca. 3400mAh battery.
Have you noticed such a high drain with those lit caps from Simon?