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Anonymous Poster

Lux Calcultion For Street Lighting

07/09/2010 10:14 AM

how to calculate lux level for street lighting if my area is 6M wide and 1000M Lenght Wise and my pole height is 9M with Single arm with 250watts metal halide light and its luminous Flux 1900lm kindly help me out for its calculation with example
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PWSlack
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#1

Re: lux calcultion for street lighting

07/09/2010 10:30 AM

It does depend upon the size and shape of the reflector and the diffuser....

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Usbport
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#2

Re: lux calcultion for street lighting

07/09/2010 11:28 AM

Well, if you assume that the 1900 lumens is a point source radiating uniformly over the hemispherical region below the lamp, then the lux level at any given point depends on the distance r to the lamp via the equation:

Lux = lumens/(2*pi *r2), where r is the distance in meters.

For the spot on the ground directly below the lamp, the distance is 9 m, so

Lux = (1900)/(2*pi*92) = 3.733 Lux

For any other spot within your 6M x 1000M rectangle use the pythagorean formula in 3 dimensions to get the distance, then determine the Lux.

If the lamp uses a reflector and lens (thus it is not a point source), you'll need to figure out what corrections are required.

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Anonymous Poster
#4
In reply to #2

Re: lux calcultion for street lighting

07/10/2010 11:51 AM

Lux = lumens/(2*pi *r2)

kindly explain me how u get p value and i value

Best Regards
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Anonymous Poster
#5
In reply to #4

Re: lux calcultion for street lighting

07/10/2010 12:09 PM

stupid question. Have you not studied school. pi = 3.14
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Hameedullah Ekhlas
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Join Date: Feb 2010
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#3

Re: Lux Calcultion For Street Lighting

07/09/2010 1:19 PM

See below link there are many softwares for street light lux calculation.

http://www.filebuzz.com/findsoftware/Street_Lighting_Lux_Calculation/1.html
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