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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 ]
7 cze 2024 · 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.
Illuminance. To help compare different orders of magnitude, the following list describes various source in lux, which is a lumen per square metre. Luminance. This section lists examples of luminances, measured in candelas per square metre and grouped by order of magnitude. See also. Photometry (optics) Extraterrestrial sky. Notes and references.
Illuminance is a measure of how much luminous flux is spread over a given area. One can think of luminous flux (with the unit lumen) as a measure of the total "amount" of visible light present, and the illuminance as a measure of the intensity of illumination on a surface.
Illuminance is used to construct a local and short-term metric assessing the amount of light with a one-tailed criterion. Different illuminance thresholds are associated to the different building typologies and kind of use of spaces in a building.
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 =
Isotropic: the same in all directions. Light: radiant energy that is capable of exciting the retina and producing a visual sensation. Light forms a very small part of the electromagnetic spectrum, from about 380 to about 780 nanometers — between ultraviolet and infrared radiation.
