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Light Meter is a mobile app that measures illuminance in lux, allowing users to quantify the brightness of their environment. It helps determine whether artificial lights are sufficient for stimulating cortisol release or if sunlight is necessary.
If you really want to get technical and you really want to measure how much light is in your environment, you can download a free app,something like Light Meter, and that will allow your phone to act as a bit of a light meter.
""Huberman suggests using a light meter app to measure the lux of light sources, helping users to evaluate the effectiveness of their light exposure."