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[deleted] t1_ixvk435 wrote

Reply to comment by Bbrhuft in What is the the irradiance (W/m^2) range of human vision? by DeismAccountant

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Bbrhuft t1_ixvwxhc wrote

The energy carried by a single photon of 500 nm light is 4.0 × 10^−19 J.

The approximate conversion is 1 Lux = 0.0079 W/m^2 for sunlight that has a peak at 500 nm.

3.16 × 10^21 lux.

The brightness at noon at the equator is 111,000 lux, of which (albedo) for bright sand is 0.4. So sand in desert at the equator at noon, will be around 44,000 lux.

Which is a dynamic range of approximately 1.4 × 10^25 .

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DeismAccountant OP t1_ixvzbjf wrote

Wait is this maximum or minimum?

Thank you so much but I’m sorry I’m so confused. Unless one is minimum and the other maximum.

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