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With the announcement of Face ID, I wonder, will work in the dark? For example, a dark room? Does the screen allow enough light for it to work?

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Face ID works in the dark thanks to the flood illuminator. This means Face ID is not dependent on external light sources or purely the light emitted from the display.

Flood Illuminator

Invisible infrared light helps identify your face even when it’s dark.

https://www.apple.com/iphone-x/#face-id

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