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There are many different methods of measuring light, and some of the relevant ones for this thought experiment are as follows:
Candela — intensity of light emitted by a source in one particular direction.
Lumen — quantity or flux of light emitted by a source. This takes into the account that most lights (like a candle) are essentially omnidirectional and shoot light out at lot of different angles
Lux — a measurement of lumens when applied to a surface area or 1 lumen/sq. meter. Light gets dimmer as it is spread out over a larger area
Foot-candle — related to lux, but uses the imperial system of measurement instead. 1 foot-candle = 1 lumen/sq ft. = ~10lux
Nits — similar to lumens, but used more as a brightness measurement for display devices like smartphone screens and monitors where there isn’t a single point of light, but rather a field of light.Example lux readings from wikipedia:
Moonlight Night/Starlight — 0.0001 lux
Full Moon, Clear Night — 0.36lux
Home lighting — 50–250lux
Overcast Day — 1000lux
Direct Sunlight — 32,000–100,000luxhttps://medium.com/@laserpilot/how-to-do-video-projection-in-full-daylight-52baef137115
https://sciencing.com/convert-nits-lux-7448702.html
https://www.hioki.com/en/products/listUse/?category=19
https://www.sekonic.com/united-states/
https://pt.wikipedia.org/wiki/Lux%C3%ADmetro
https://physics.nist.gov/cuu/Units/candela.html
https://www.lifewire.com/understanding-nits-lumens-brightness-4125499
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