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# Luminous flux of lifting Lighting LED

Time：2021-03-12 View：

LED luminous flux is the luminous flux of led light source, which is called the amount of light emitted per unit time. Unit: lm. This quantity describes the size of the total amount of light emitted by the light source and is equivalent to the optical power. The larger the luminous flux of the light source, the more light it emits.
Luminous flux is also an artificial quantity, which may be different for other animals, let alone completely natural things, because this definition is completely based on the human eye's response to light.

Definition
The amount of light emitted by the led light source per unit time is called the luminous flux of the led light source.
Unit: lm. The amount of light emitted by the light source per unit time is called the luminous flux of the light source. Similarly, this quantity describes the total amount of light emitted by the light source, which is equivalent to the optical power. The larger the luminous flux of the light source, the more light it emits.
For isotropic light (that is, the light of the light source emits at the same density in all directions), then F = 4π I. In other words, if I of the light source is 1cd, the total flux is 4π = 12.56lm. Compared with the unit of mechanics, luminous flux is equivalent to pressure, while luminous intensity is equivalent to pressure. If we want the exposed point to look brighter, we should not only increase the luminous flux, but also increase the means of convergence, which is actually to reduce the area, so as to obtain greater intensity.

Principle
Luminous flux is also an artificial quantity, which may be different for other animals, let alone completely natural things, because this definition is completely based on the human eye's response to light.
Human eyes have different feelings of light of different colors, which determines the conversion relationship between luminous flux and optical power.
For the 555nm yellow and green light most sensitive to human eyes, 1W = 683lm, that is to say, the power of 1W is all converted into light with wavelength of 555nm, which is 683 lumens. This is the maximum light conversion efficiency and the calibration value, because human eyes are most sensitive to 555nm light.
For other colors of light, such as 650nm red, 1W of light is only equivalent to 73 lumens, which is because human eyes are not sensitive to red light.
For white light, it depends on the situation, because many lights with different spectral structures are white.