The unnecessary lighting of the night sky and environment is called light pollution.

That featureless glow of our nocturnal skies is called “light pollution.

The illumination of the fourth floor of the pavilion in front of the girls is also quite curious, especially if this illumination was important enough to "erase" the trees.

The system is configured to increase or maximize an illumination of the projected content in a particular portion of the rear projection screen compared with the projected content in other portions of the screen.

It is easily measured with a light meter (it’s being used by professional photographers to check the good illumination of the subject – also known as the “cell”).

(2) For a visual test in a darkened, or semi-darkened room, a test illumination level of approximately 15 lx, normally corresponding to a brightness of 10 cd per square meter, should be adopted.