In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [ 2 ]

2024年6月7日 · Illuminance serves as the quantitative backbone for understanding how light interacts with surfaces. It represents the quantity of light falling onto a given surface area. Conceptually, it signifies the brightness that an observer would perceive on a surface under the influence of incident light.

2024年5月7日 · What Is Illuminance? In a single sentence, the illuminance formula means how much luminous flux is spread over an area — it is the intensity of light falling onto a surface. Illuminance is a concept of photometry, represented by the amount of light received on a surface. Illuminance also relates to how humans perceive an illuminated area's ...

2012年3月26日 · Illuminance is the amount of light striking a surface – also known as incident light, where the “incident” is the beam of light actually landing on the surface. Illuminance is calculated as the density of lumens per unit area and is expressed using footcandles (lumens/square foot) in the United States or the metric version, lux (lumens ...

Illuminance is a term that describes the measurement of the amount of light falling onto (illuminating) and spreading over a given surface area. Illuminance also correlates with how humans perceive the brightness of an illuminated area.

Illuminance characterizes light inpinging an illuminated object, while the luminance is relevant for the visual brightness of an object and also takes into account the angular distribution. More to Learn

Illuminance refers to the amount of light that shines onto a surface, measured in lumens per square meter (lm/m 2), also called lux. Lux is an essential consideration for interior lighting design for spaces where humans live and work.

2020年12月27日 · The portion of a light ray that falls on a surface is a quantity of illuminance. Calculating illuminance alongside other values that describe brightness can help you understand phenomena of light better.

Irradiance and Illuminance Definition: The irradiance (illuminance) is the power per unit area incident on a surface. This is sometimes referred to as the radiant and luminous incidence. 2 (, )cosiii H E xLx d=∫ ωθω L(ω i) θ i 2 ( ) ( , )cosiii d dE x L x d dA ωθω Φ ≡= 22 Wlm lux mm =

Illuminance and luminance are two important photometric parameters in lighting design. Both take into account the brightness sensitivity curve of the human eye. Illuminance is a measure of the light incident on a surface, whereas luminance describes the light reflected from it.