Flux is a common optical index of solar street lights and led street light,

Flux is the main parameter of a LED street lamp lighting, is the amount of visible light emitted per second. It is to choose the solar street light led light source, a very important parameter 'luminous flux ( luminous flux） Refers to the human eye from the human perception can

flux is the main parameters of led street lamp lighting, it is the sum of visible light from the light source per second. It is to choose the solar street light led light source, a very important parameter 'luminous flux is refers to the human eye can feel from people's perception of radiant energy, radiant energy, it is equal to a particular band and this band in unit time relative visibility of the product. Because the human eye to different wavelengths of light relative visibility, when different wavelength of light radiation power is equal, luminous flux is not equal. Luminous flux ( φ) Is defined as the unit of time point light source or non point source of energy, which can generate visual ( People can feel the radiation flux) Referred to as the luminous flux. The unit of luminous flux is lumen ( Abbreviation for lm) , lumen ( Lumen or lm) Defined as the international standard candle light source to unit 3 d arc Angle by luminous flux. Because the entire sphere area is 4 PI R2, so the level of luminous flux is equal to the candle light flux about a quarter of the PI, or sphere has 4 PI. Therefore, based on the definition of lumen, CD can know the point source emission 4 PI lumens, namely phi ( Lumens) = 4 PI I light stick traffic ( Candle) 。 Assuming that delta is a small three-dimensional arc Angle, omega and luminous flux delta phi in delta within the solid Angle, omega is exist