Windows Hello facial recognition no longer works in poorly-lit rooms This is due to a move Microsoft made to shore up security with the feature The change to require a ‘color camera to see a ...

If your PC only has one or the other, you don’t really have a choice — use whichever Windows Hello method is available to you. If it has both, then you can actually use both.

Facial recognition through Windows Hello has used IR sensors to save a 3D scan of a user's face, without the need for visual confirmation through a webcam, for years.