One of the often discussed themes is so called “light pollution“. A long time we participate in research in this area and we have a direct experience with a lot of measurement of the night sky, night city background, and luminance analyses. For example, you can see on the pictures below which were obtained during measurement in Liberec in 2009.
With luminance meter LDA – LimiDISP you are able to measure so small luminance, as you cannot see by eye – in levels below 0,001 cd.m-2. It can be very useful for checking light in protected natural areas, parks and zones, where light pollution should be limited.