Definition: | time integral of the spherical irradiance He,o at the given point over the given duration Δt
unit: J • m-2 = W • s • m-2
NOTE – The analogous quantities luminous spherical exposure Hv,o and photon spherical exposure Hp,o are defined in a similar way, replacing spherical irradiance Ee,o by spherical illuminance Ev,o or photon spherical irradiance Ep,o.
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