(ii) The irradiance (W cm−2) or radiant exposure (J cm−2 equivalent to the radiant power (W) orradiant energy (J) detectable through a circular aperture stop having a diameter of 7 millimeters and, for irradiance, within a circular solid angle of acceptance of 1 × 10−3 steradian with collimating optics of 5 diopters or less, divided by the area of the aperture stop (cm−2).