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IN LATE 2019, TCL flew me to the company's U.S. offices in California to spend an afternoon with its new flagship, the 75Q825 8-Series Roku LCD Ultra HDTV, a 75-inch 4K model. As noted earlier, I didn't perform a Dolby Vision calibration (as with HDR10, white balance and color management settings cannot be set differently from the SDR settings without skewing the latter's calibration). After calibration, changes to the main menu settings reduced the peak HDR brightness to 545 nits with a black level of 0.0019 nits. The Roku Mobile app's white balance settings can't be separately adjusted for SDR or HDR (HDR10 or Dolby Vision). [Extracted from the article]

VIZIO HAS long been a value leader in the HDTV world. The postcalibration brightness of the M-Series Quantum measured 72.7 nits at 50% and the black level 0.004 nits, for an effective HDR10 full-on, full-off contrast ratio, not including the effect of bright highlights, of 18,175:1. The pre-calibration white balance Delta Es of the Vizio reached a maximum of 7.8 at 65%, but much of this high value is due to luminance errors being included in the Delta E computation (performed automatically in the CalMAN program). HDR luminance measured 220 nits on a 2% white window, 440 nits on a 10% window, 435 nits on a 25% window, and 320 nits on a 100% window. [Extracted from the article]

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