Ok, now I have to add my bit to this discussion. I just went back a week to the first post here about the "black glow" and read forward. The discussion has been interesting (or somewhat interesting), but for the most part I'm not seeing a clear reason that most people (except those of the "if LG claims perfect black level then they MUST provide perfect black level" ilk) would be concerned about any "black glow". It happens that a few days ago my B6 updated to the latest FW automatically. I've been looking for any "black glow" issues in normal content but have seen no reason at all to be concerned. While I can view in pretty damn dark conditions, I don't view in a dead black room. And I'm not a gamer, so "don't care".
Now the real reason for this post -- I also noted that some have said the 05.30.03 firmware has included an "unannounced" and therefore "unofficial" upgrade for HLG. Today I downloaded that HLG demo that
and others provided ( http://4kmedia.org/lg-cymatic-jazz-hdr-hlg-uhd-4k-demo/
) and was absolutely blown away! I have numerous HDR UHDs (including Deadpool
and other so-called "reference" discs) and I have the DV demos, and I have never seen an HDR level as outstanding as this jazz demo. (I have yet to see a DV UHD, so no comparison on that yet available.) The depth of color, the vast array of color, and the varying light intensities have never been displayed in such spectacular splendor! It's difficult to point to particular images since this quality is on display throughout the demo, but I especially noted the effects in the splashing bubbles and the flickering flames. But even those single-color paint splashes appear with such multiple tone and luminance variations that they were dazzling and three dimensional. It is simply difficult to describe. This is what HDR is supposed to be. IMO, it's is worth getting the FW update just to be able to view and show this demo regardless of any supposed "black glow".
Keep in mind that this was viewed in a bright, sunlit room. I first watched the demo from my OPPO which did NOT provide the HLG output. Then I changed to the USB on the LGB6. The "HLG HDR" bubble popped up in the upper right corner and the change was immediately noticeable -- did not require an A/B to see it. Even when I called my wife (who just don't care) in to see the demo, she immediately exclaimed over how beautiful the image was and could see those amazing variations. To use the word "kalaidescope" in this description would be a disservice to HLG. I always thought that HLG would somehow be a lesser quality of HDR, but this certainly is NOT lesser. Why do I care since there is no broadcast HDR service in the US? Because this HLG demo is worth having no matter what and because we have a technologically leading-edge TV station in our area that will probably be one of the first to provide HLG broadcasts -- even if it takes a few more years.
So YMMV, but for MY B6 panel and MY satisfaction, the 05.30.03 FW update is well worthwhile. And this HLG demo is now top of my list to show off my system. (That includes the sound system -- even without Atmos/DTS:X, the audio is marvelous and I'm not even a great fan of jazz!)