The iPhone XS Max has a Record high calibrated 100% APL Full Screen Brightn

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The iPhone XS Max has a Record high calibrated 100% APL Full Screen Brightness for OLED Smartphones of 660 nits for the sRGB/Rec.709 and DCI-P3 Color Gamuts, which improves screen visibility in high Ambient Light. On its Home Screen the iPhone XS Max produces an impressively bright 725 nits. See the Screen Brightness section for the measurements and details. For comparison, the Samsung Galaxy S9 and Note9 can produce up to 710 nits 100% APL Full Screen with their Auto High Brightness Mode, but only in High Ambient Light with a non-standard Native Color Gamut and White Point.