The luminous flux is an index indicating the overall brightness of the light source. The unit is lm (lumens). It is often used when indicating the brightness of an illumination source. It refers to the physical sensitivity of the human eye (visual sensitivity) to represent the physical quantity of light emitted by the light source. The specific value is an isotropic light source with a luminous intensity of 1 cd (candela). The luminous flux radiated within a solid angle of 1 sr (stereoscopic arc) is 1 lm. Here, sr is a unit of a solid angle, and indicates an apex angle of a quadratic power (r2) of an area where the area intercepted from the spherical surface of the sphere is a radius (r).
The luminous flux is an index indicating the overall brightness of the light source. The unit is lm (lumens). It is often used when it shows glare such as a display LED. It is defined as: a light source emitting 540×1012 Hz (wavelength 555 nm) monochromatic light with a light emission intensity of 1/683 W/sr in a specified direction, and the light intensity in this direction is defined as 1 cd.
Luminance is an index indicating the intensity of light emitted from the secondary light source such as the light source, the reflective surface, and the transmission surface to the observer. The unit is cd/m2. Like the luminous flux, it is the physical quantity expressed in conjunction with the sensitivity of human eyes. They are often used to indicate the brightness of display screens such as liquid crystal panels and PDPs.
The illuminance is an indicator of the brightness of light that is irradiated on a plane. The unit is lx (lux), sometimes also labeled lm/m2. It refers to the luminous flux per unit area in the light flux emitted from a light source to a planar object. Used to compare the brightness of lighting fixtures on a flat surface.
The relationship between luminous flux, light intensity, brightness and illuminance is summarized as follows: luminous flux divided by unit solid angle equals light intensity; luminous flux divided by unit area equals illuminance, light intensity divided by unit area equals brightness.
The luminous flux is an index indicating the overall brightness of the light source. The unit is lm (lumens). It is often used when it shows glare such as a display LED. It is defined as: a light source emitting 540×1012 Hz (wavelength 555 nm) monochromatic light with a light emission intensity of 1/683 W/sr in a specified direction, and the light intensity in this direction is defined as 1 cd.
Luminance is an index indicating the intensity of light emitted from the secondary light source such as the light source, the reflective surface, and the transmission surface to the observer. The unit is cd/m2. Like the luminous flux, it is the physical quantity expressed in conjunction with the sensitivity of human eyes. They are often used to indicate the brightness of display screens such as liquid crystal panels and PDPs.
The illuminance is an indicator of the brightness of light that is irradiated on a plane. The unit is lx (lux), sometimes also labeled lm/m2. It refers to the luminous flux per unit area in the light flux emitted from a light source to a planar object. Used to compare the brightness of lighting fixtures on a flat surface.
The relationship between luminous flux, light intensity, brightness and illuminance is summarized as follows: luminous flux divided by unit solid angle equals light intensity; luminous flux divided by unit area equals illuminance, light intensity divided by unit area equals brightness.
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