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3.3 Light measurement
The detector measures artificial and daylight that is reflected directly below the
detector (aperture ± 30°).
The surface brightness below the installation
site is used as a lighting level reference.
Switching
With indirect lighting, the artificial light at
the detector installation site must not exceed
2000 Lux (with brightness value >200 Lux ).
Constant light control
The detector must be positioned so that it only receives artificial light that it con
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trols itself. Artificial light controlled by other detectors or manually operated work
lights affect the brightness measurement of the detector. Direct artificial light on
the detector should be avoided.
Correction factor
The room correction factor is defined as a proportion for the brightness measure
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ments differece on the ceiling and the surface below the installation site.
