Small lighting knowledge | do you know about the sun? - China lighting network

Sunlight, also called solar radiation, is the sun into space. The sun is a surface temperature of 6000 k (date Kelvin) The hot gas. Sunlight spectrum ranging from gamma to radio waves, and 99. More than 9% of the energy is concentrated in the 0. 2 - 10um( Micron) The spectral range. About 50% of the solar radiation energy in the visible spectrum area, 7% in the ultraviolet spectral region, 43% in the infrared spectral region.

in the land of the earth in yue, when average distance of the earth's upper atmosphere is perpendicular to the sun's rays radiation intensity of illumination, known as the solar constant, its value is about 1367 w/m2, Watts per square metre) 。 Sunlight through the atmospheric scattering and absorption happens, most can directly reach the ground, known as the direct sunlight; Part of the scattering and then reach the ground, called scatter light. Sunlight through the atmosphere and intensity and the spectral power distribution are changed. Direct sunlight correlated color temperature is about 5000 k, the correlated color temperature of the sun is about an average of 6500 k. A place of the intensity of sunlight with latitude, altitude, Angle of the sun and the weather and climate conditions. The sun is a huge cheap energy. Biomass, wind, water, and temperature difference can and tide to evening, in the final analysis is the conversion of solar energy. The sun gave birth to the rich and colorful world, the sun to the human body health and mental has important influence. More than 80% of the information is passed to humans through visual, without lighting will not get a lot of information through the visual. The sun ( Including produced by reflected the sun the moon and moonlight) For human lighting has irreplaceable important position, it is the only man invented fire before lighting light source. Are still indispensable to people during the life of the natural light. At present, people have developed more and more methods will be solar energy for lighting, such as solar panels during the day to receive solar energy and stored for night lighting, using optical methods such as the sunlight into the interior lighting, etc. YanZhiXiang

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