Accurate measurement can be performed at luminance and chromaticity around calibration light source. |
Transition Zone: Distance over which the luminance is reduced from the value at the end of the entrance zone to that inside the tunnel. |
These effects of mean luminance are more complex than those seen for homochromatic flicker. |
First, the.5 log unit ND reduction of luminance may have been excessive for a photopic task. |
Ordinary outdoor scenes in daylight have an average luminance of several hundred candles per square foot. |
As a result, the stability of the luminance and the chromaticity can be preserved against age deterioration. |