Diffusor with 8 mm measuring diameter
The irradiance measurements are carried out with a special diffuser. This must have a minimum measuring diameter of 7 mm. This applies in particular to the measurements in which the human eye and thus the pupil are simulated (Actinic UV Eye, UVA and Eye IR). Therefore, a special diffusor (ACC 026) is used.
In addition, the measurements of Actinic UV, UVA and Eye IR demand a limiting aperture of 80°, which is realized with the ACC 028 accessory.