Andrew Huberman· PhD
on a sunny day so no cloud cover provided that the sun is not yet overhead it's somewhere low in the sky could have just crossed the horizon or if you wake up a little bit later it could be somewhat low in the Sky basically the intensity of light the brightness is somewhere around 100,000 Lux Lux is just a measurement of brightness on a cloudy day it's about 10,000 luxs okay so tenfold reduction but bright artificial light very bright artificial light is somewhere around a thousand luxs and ordinary room light is somewhere around 100 to 200 lucks