About Luminous Flux Of Moving Head Light

About Luminous Flux Of Moving Head Light


 Definition: Luminous Flux refers to the radiant power that can be felt by the human eye, which is equal to the product of the radiant energy of a certain band in a unit time and the relative visibility of that band. Because the relative visibility of the human eye to various wavelengths of light is different, when the radiant power of wavelengths of light is equal, their luminous fluxes are not equal

Unit: The unit of luminous flux is "lumen", which is usually expressed by Φ, and its unit is theoretically equivalent to the electrical unit watt. Therefore, according to the standard light source and normal vision measurement unit, "lumen" is adopted, and the symbol is lm.

For stage lighting, there are two ways to interpret the luminous flux. The first is the luminous flux of the light source, that is, the luminous flux of the light source itself, and the luminous flux measurement methods of bulbs and LEDs (including LED beads and LED modules) are different . The following figure is the test method for the luminous flux of light sources such as bulbs.

 

The second type refers to the output luminous flux of the entire lamp. Generally, a large integrating sphere is used for testing. The test luminaire is usually placed in the center of the sphere and is used to collect all light at a solid angle of 4π. Generally speaking, the higher the luminous flux of the whole lamp of a luminaire, the better the luminaire performs at a large angle (40 °). The performance here refers to data such as the illuminance and spot uniformity of the light emitted by the lamp. The following figure shows the test result of the integrating sphere.

The luminous flux of the light source has the following relationship with the luminous flux of the luminaire.

Lamp output efficiency = lamp luminous flux / light source luminous flux x100%

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