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illuminance

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illuminance
illuminance Optics. (ɪˈl(j)uːmɪnəns) [f. L. illūmin-āntem (see illuminant a. and n.) + -ance.] The amount of luminous flux per unit area; = illumination 1 b.1943 D. H. Jacobs Fund. Optical Engin. iv. 66 We have derived equations that give the illumination (or illuminance) only at points on the axis ... Oxford English Dictionary
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Luminance (disambiguation)
luminance, luminance normalized with respect to a reference white Luma (video), an approximation of relative luminance, used in video signals See also Illuminance wikipedia.org
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Illuminance - Recommended Light Levels - The Engineering ToolBox
EN 12464 Light and lighting - Lighting of workplaces -Indoor work places, the minimum illuminance is 50 lx for walls and 30 lx for ceilings. Earlier it was common with light levels in the range 100 - 300 lux for normal activities. Today the light level is more common in the range 500 - 1000 lux - depending on activity.
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Orders of magnitude (illuminance)
As visual perception varies logarithmically, it is helpful to have an appreciation of both illuminance and luminance by orders of magnitude. See also Photometry (optics) Extraterrestrial sky Notes and references Illuminance Photometry wikipedia.org
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By how much should the distance from the source be increased to reduce the surface illuminance to 30 lumens? This is my problem and I have no idea how to solve it: The illuminance of a surface varies inversely with ...
For a given distance $d$, you can get the luminance with $$d^2=\frac{k}{l}$$ where $k$ is a constant. $l$ is your luminance, which varies inversely (hence the reciprocal of $l$) and with the square of the distance (hence $d^2$). As such you have $$(d_1)^2=\frac{k}{l_1}$$ and $$(d_2)^2=\frac{k}{l_2}$...
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Daylighting
Illuminance measurements on a grid is a basic level to derive an average illuminance of a space. Illuminance distribution Besides determining how much illuminance is received on a horizontal surface, a method that analyses annual illuminance distributions wikipedia.org
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Lux
Explanation Illuminance Illuminance is a measure of how much luminous flux is spread over a given area. SI derived units Units of illuminance wikipedia.org
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How to solve the integral $IR_0\int_0^{\sqrt{R^2-R_0^2}}(R_0^2+x^2)^{-\frac{3}{2}}dx$? This integral is to calculate total illuminance of a circular surface. $$ I\,R_{0}\int_{0}^{\,\sqrt{\,R^{2} - R_{0}^{2}\,\,}\,}\\...
Let $x=R_0\tan(\theta)$ so that $dx=R_0 \sec^2(\theta)\,d\theta$. Then, denoting by $\theta_0$, $\theta_0=\arctan\left(\frac{\sqrt{R^2-R_0^2}}{R_0}\right)$, we have $$\begin{align} IR_0\int_0^{\sqrt{R^2-R^2_0}}\left(R^2_0+x^2\right)^{-3/2}\,dx&=\frac{I}{R_0} \int_{0}^{\theta_0} \cos(\theta)\,d\theta...
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Foot-candle
A foot-candle (sometimes foot candle; abbreviated fc, lm/ft2, or sometimes ft-c) is a non-SI unit of illuminance or light intensity. Alternatively, it can be defined as the illuminance of one lumen on a one-square foot surface with a uniform distribution. wikipedia.org
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Troland
Troland, is a unit of conventional retinal illuminance. However Troland is linked to retinal illuminance in as follows. wikipedia.org
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Daylight
However, the outdoor illuminance can vary from 120,000 lux for direct sunlight at noon, which may cause eye pain, to less than 5 lux for thick storm clouds Intensity in different conditions For comparison, nighttime illuminance levels are: For a table of approximate daylight intensity in the Solar System wikipedia.org
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川内伦子
" Christophe Guye Galerie, 苏黎世 2012年 "Light and Shadow" Silencio, 巴黎 "照度 あめつち 影を见る" 东京都写真美术馆 "Light and Shadow" TRAUMARIS, 东京 2011年 "Illuminance" Ilan Gallery, "A Glimmer in Silence" FO.KU.S Kunst Stadtforum, 因斯布鲁克 "Illuminance" FOIL GALLERY, 东京 "Illuminance" Gallery at Hermès, 纽约 "murmuration" Rose wikipedia.org
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22:00 ~ 6:00 睡眠比 2:00 ~ 10:00 更健康吗？
为了量化评价光照系统对健康的影响，他们引入了两个概念，可视照度 (visual illuminance, VIL)，生物钟照度 (circadian illuminance CIL)，这两个中文是我瞎掰的，后面还是用英文简写代替……VIL 比较容易理解，就是可见光照在表面，可以用照度单位 lx 衡量， zhihu
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Display contrast
When these display-screens are used outside a completely dark room, e.g. in the living room (illuminance approx. 100 lx) or in an office situation (illuminance In a realistic application situation with 100 lx illuminance the contrast ratio goes down to ~350, with 300 lx it is reduced to ~120. wikipedia.org
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Surgical lighting
Central illuminance (Ec) Illuminance (measured in lux) at 1m distance from the light emitting surface in the light field centre. Light field centre Point in the light field (lighted area) where illuminance reaches maximum lux intensity. wikipedia.org
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