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1.10: Irradiance E
https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Stellar_Atmospheres_(Tatum)/01%3A_Definitions_of_and_Relations_between_Quantities_used_in_Radiation_Theory/1.10%3A_Irradiance_E
If the luminous intensity of a source of light in some direction is one candela, the irradiance of a point on a surface that is closest to the source is $1 \text{lm m}^{-2}$ if the distance is one m...If the luminous intensity of a source of light in some direction is one candela, the irradiance of a point on a surface that is closest to the source is $1 \text{lm m}^{-2}$ if the distance is one metre, $1 \text{lm cm}^{-2}$ if the distance is one cm, and $1 \text{lm ft}^{-2}$ if the distance is one foot.

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