What is the approximate outdoor illumination on a sunny day or a cloudy day?

Category: Region

Problem description:

Under various weather conditions, what is the outdoor illumination in the morning, noon, and evening?

p>

Analysis:

Illumination can be measured directly with a light meter. The unit of illumination is lux, which is the transliteration of English lux and can also be written as lx. When the luminous flux obtained by an object uniformly illuminated by light is 1 lumen in an area of ??1 square meter, its illumination is 1 lux. Sometimes in order to make full use of the light source, a reflective device is often attached to the light source so that more light flux can be obtained in certain directions to increase the illumination on the illuminated surface. For example, car headlights, flashlights, photography lights, etc.

The following are various environmental illumination values: unit lux

Dark night: 0.001-0.02; moonlight night: 0.02-0.3; cloudy indoor: 5-50; cloudy outdoor: 50- 500; indoors on a sunny day: 100-1000; illumination under the sun at noon in summer: about 10*9 power; illumination required for reading books and periodicals: 50-60; standard illumination for home cameras: 1400.