Apple intends to include a Flashlight in future Apple Watches.

Forget about the dim light from the Apple Watch screen; Apple is working on developing a stronger external light that can be attached to a Watch band.
The Apple Watch already has a flashlight, albeit it isn’t as well recognized as the one in the iPhone. That’s because, in comparison to the iPhone’s flashlight, Apple prefers to keep the Watch’s flashlight hidden.

On an Apple Watch, press the side button and then slide down the screen until you see a flashlight icon. Simply tap it, and prepare to be disappointed at first.

That’s because when you activate the flashlight, the entire Apple Watch face goes totally white (or flashing white or red to attract help).

Forget about the dim light from the Apple Watch screen; Apple is working on developing a stronger external light that can be attached to a Watch band.
The Apple Watch already has a flashlight, albeit it isn’t as well recognized as the one in the iPhone. That’s because, in comparison to the iPhone’s flashlight, Apple prefers to keep the Watch’s flashlight hidden.

On an Apple Watch, press the side button and then slide down the screen until you see a flashlight icon. Simply tap it, and prepare to be disappointed at first.

This suggests removing the on-screen flashlight and replacing it with a genuine one on the Apple Watch. It would be attached to the band, close to the Watch chassis, and shine wherever you point, “separate from the display of the wearable device.”

“Put another way,” Apple explains, “when illuminated, light sources… generate visible light cast in a direction that is parallel, or at least substantially parallel, to an axis defined by a user’s appendage (not shown) when the appendage passes through band.”