Why a Lux Reading Is Not the Same as Human Brightness Perception
Light sensors feel intuitive: bright environment, high reading; dark environment, low reading. They are used in smart lights, screen auto-brightness, e-paper devices, plant lighting, and outdoor devices.
But 500 lux does not mean every application is equally bright. It may not match human comfort, camera exposure, or plant photosynthesis.
The first model is: a light sensor measures optical response at its own position and angle. A lux output is illuminance weighted by human photopic vision, not universal light-energy truth.
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