Small lighting knowledge | what is light? - China lighting network

At first, people can cause eye 'ray' of 'bright' feeling are referred to as the 'light'. With the progress of science, realize the light is an electromagnetic wave, also known as the electromagnetic radiation. It the launch of the waves and stations, television stations belong to the categories. But it is much shorter wavelength. From 1 nm wavelength ( Nm) To 1 mm ( Mm) ( 1 nm = 10 to the negative power 6 nm) Of electromagnetic radiation are optical research object, therefore, this period of electromagnetic radiation called optical radiation, hereinafter referred to as optical radiation. Wavelengths from about 380 - 780 nm this small part of the spectrum is the human eye can perceive visible light, or more accurately, visible radiation, should call visible radiation. Visible radiation produces light touch is a kind of physiological effect. Like we eat sugar, we feel the sweetness of sugar and sugar stimulate taste organs to produce a physiological effect. So we should put the visible radiation energy to produce a sense of bright visual organs physiological effect and the visible radiation itself apart. Just as sweetness and sugar is not the same thing. The word 'light' have different meanings in different places. Sometimes refers to the visible radiation, sometimes refers to the visible radiation effects on the physiological effects of visual organs that luminous effect, is sometimes referred to as the optical radiation. YanZhiXiang

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