radiant cylindrical exposure (at a point, for a given direction and duration) [He,z]

time integral of the cylindrical irradiance, Ee,z, at the given point for the given direction, over the given duration, Δt


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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