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