![]() ![]() For white light, it depends, because many different spectral structures are white. The light of 1w is only equivalent to 73 lumens, which is because the human eye is not sensitive to red light. For other colors of light, such as red at 650nm, This is the maximum light conversion efficiency and is also the calibration value, because the human eye is most sensitive to 555nm light. The human eye perceives light of different colors differently, and this perception determines the conversion relationship between luminous flux and optical power.įor the most sensitive yellow-green light of 555nm, 1W=683lm, that is to say, the power of 1W is all converted into light with a wavelength of 555nm, which is 683 lumens. You must know that the luminous flux is also an artificial quantity, which may be different for other animals, and it is not a completely natural thing, because this definition is completely based on the response of the human eye to light. To make the irradiated point look brighter, we must not only increase the luminous flux, but also increase the means of convergence, which is actually to reduce the area, so that greater intensity can be obtained. Compared with mechanical units, luminous flux is equivalent to pressure, and luminous intensity is equivalent to pressure. That is to say, if the i of the light source is lcd, the total luminous flux is 4π=12.56lm. the light from the light source is emitted with the same density in all directions), then f-4πi. The greater the luminous flux of the light source, the more light is emitted.įor isotropic light (i.e. Similarly, this quantity is for the light source, which describes the total amount of light emitted by the light source, which is equivalent to the optical power. The higher the lumen value, the brighter it is, and the higher the brightness, the need to turn off the light when projecting.Īnsi is the abbreviation of American National Standards Institute (American National Standards Institute). It measures the illuminance of each point on the nine intersections of the “field” shape of the screen, multiplied by the area, and then finds nine The average value of the points is the ANSI lumens of the projector. Ansi lumens is a standard for measuring the luminous flux of projectors formulated by the American National Standards Institute. The unit of projector’s luminous flux is ANSI lumens. ![]()
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