Luminaire s/p ratio, les infos

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13 sept. 2017 - you might have noticed that some lighting products have an s/p ratio among their specifications. to explain what this means, consider that ...

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in the world of lighting, we measure foot candles with a light meter, this is called a photopic ... for example, the s/p ratio for high pressure sodium is 0.40.

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the use of white light for street lighting has increased as the efficacies and colour ... in general, white light sources have high s/p ratios – with yellow/orange ...

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general lighting. what is a s/p ratio and ... once this ratio is known, a scotopic value ... the following figures show the s/p ratios for some common lamps:.

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17 mars 2016 - as solid-state lighting technology advances and achieves traction in the lighting ... the scotopic/photopic ratio, or s/p ratio, is a multiplier that ...

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find definitions in our comprehensive lighting glossary. ... the ratio of the hot resistance to the cold resistance is also measured (rh/rc). ..... s/p is calculated as the ration of scotopic lumens to photopic lumens for the light source on an ansi ...

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and a common indicator of mesopic effectiveness for a lighting solution is the s/p ratio. but what is mesopic vision, why is it important and what is an s/p ratio?

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2 janv. 2009 - this assist recommends was prepared by the lighting research ..... cd/m2 (intersection of s/p ratio of 0.65 and photopic luminance of 0.1 ...

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defining all of your luminaires initially is recommended, although they may be .... (see concepts tab, about halfway down,for more information on s/p ratio.) ...

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14 déc. 2009 - one can beneficially use the s/p ratio when a lamp with high s/p ratio is used in scotopic or mesopic light conditions. possibly street lighting ...

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28 août 2012 - as led lighting becomes more widely adopted there has been quite a bit of ... a higher s/p ratio allows for less foot candles to be needed to ...

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3.d paramÈtres complÉmentaires liÉs au luminaire. 3.d.1 ..... une source de lumière avec un ratio s / p élevé a une influence positive sur la vue ...

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1 août 2018 - for example, you may encounter a government specification that states, " luminaires must have a minimum s/p ratio of x. " what does this ...

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8 oct. 2013 - for example, you may encounter a government specification that states, “luminaires must have a minimum s/p ratio of x.” what does this mean ...

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maximum u ratings. u0 uplight for street lighting. lighting zones and bug ... s/p ratio. – ratio of scotopic to photopic luminous flux. – no such thing as.

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of luminaires and light sources use the available knowledge to make our streets safer .... s/p ratios, which emit higher quality light that provides the same level of.

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therefore, the aim of exterior lighting design is to increase the mesopic ... 1) input: photopic luminance l in cd m−2 as well as s/p ratio; 2) compute the scotopic ...