Light Sensitivity may be enabled in the Apple TV’s Settings by going to Accessibility > Display Accommodations and selecting it. Select Intensity from the drop-down menu, then swipe to change the percentage of display intensity. This option controls the brightness of the colors displayed on your display by adjusting their contrast.
How do I Turn on Auto Brightness on my iPhone?
Select Display & Text Size, then Auto-Brightness from the drop-down menu. While in Dark Mode, the whole iPhone experience is transformed into a dark color scheme that is ideal for low-light situations. With Dark Mode enabled, you may use your iPhone while doing anything else, such as reading in bed, without waking the person next to you.