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Street Lighting

06/14/2011 2:50 AM

Dear Sir,

Kindly let me know the minimum lux level applicable for street lights when the source is put above 9 meters from the ground.

Regards,

Shekhar

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Guru
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#1

Re: street lighting

06/14/2011 3:46 AM

How bright are the lamps?
How many of them are there?

How far apart are they spaced?

What national standards apply to such an installation?

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#2
In reply to #1

Re: street lighting

06/14/2011 3:58 AM

I wish to know the minimum lux level required at the ground. Is there any standard for the same????? means if the pole height is 9 mtr, what should be the minimum lux level that we should get at the ground???? Because with my product i am getting lux level between 8-12. Is this ok with the standards??Accordingly I will design my product.

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Guru
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#3
In reply to #2

Re: street lighting

06/14/2011 3:59 AM

What country?

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#4

Re: street lighting

06/14/2011 4:40 AM

Yes there are standards.

BUT they are specific to the countries you intend to sell to.

You've got to do your own research, we can't without the relevant information. I would add that you should be prepared to pay for that information. We are not an industrial charity.

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#6
In reply to #4

Re: street lighting

06/14/2011 5:42 AM

It is for India. I think, my question is very clear. What further information you need????

If anybody needs payment for this, then better he should cancel his id here( sorry to say that).

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#7
In reply to #6

Re: street lighting

06/14/2011 5:51 AM
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Guru
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#9
In reply to #6

Re: street lighting

06/14/2011 6:08 AM

Your question is not clear, this is an international site, how are members supposed to know where you are from if you do not indicate it.

One thing is clear, your ignorance of the role of boards such as this. we offer free advise not a free consultancy service.

To be honest I think it is you that should cancel your ID. Rudeness isn't to be tolerated.

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#10
In reply to #9

Re: street lighting

06/14/2011 6:16 AM

I am sorry for that. Wholeheartedly apologize for the same.

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Guru

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#11
In reply to #6

Re: street lighting

06/14/2011 11:15 AM

Your question is not clear. You left out the most important bits.

It's like asking "what is voltage requirement for stove?"

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Guru
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#15
In reply to #6

Re: street lighting

06/15/2011 12:50 AM

Don't worry about it. It's a perfectly valid question for this forum. Unfortunately I don't have that information for you. Hopefully another member will.

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#5

Re: street lighting

06/14/2011 5:13 AM

2o-50Lux

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Guru
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#8

Re: street lighting

06/14/2011 6:01 AM

zero
Negative values are difficult to maintain
Del

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#16
In reply to #8

Re: street lighting

06/15/2011 9:08 AM

To get negative values you install a dark. For positive values you install a light.

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Guru

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#18
In reply to #16

Re: street lighting

06/17/2011 10:25 AM

Holy crap, I laughed out loud...that's a good one.

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Guru

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#12

Re: Street Lighting

06/14/2011 11:22 AM

The required lux level is not related to the source height. In most jurisdiction the required amount of light is dependent upon the traffic density and amount of interaction between vehicles and pedestrians. In India, IS 1944 states the required lux levels for various types of motorways. It is the responsibility of the designer to determine the correct combination of fixture height, source strength and fixture spacing to achieve the required illumination at grade. You can achieve the same lux level whether you use a 9 meter pole or a 20 meter pole - you simply use a stronger source for the taller pole.

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#13
In reply to #12

Re: Street Lighting

06/14/2011 11:52 AM

Thanks for the information. Actually i shouldn't have mentioned the height of the pole. Its my mistake.

Actually I am am starting one LED lighting assembling unit in India. I wish to manufacture the product with International Standards.

I am a person who worked in switchgear line so far. Lighting and that too LED ( which is totally new concept) is new for me. So, I request you to please help me where ever i get stuck or I need clarification.

Request for your help.

Thanks and regards,

Shekhar

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#14

Re: Street Lighting

06/14/2011 6:37 PM

Have a look at a conract spec issued by Delhi government department, lux levels vary on the highways, more at junctions and crossings, from 15 lux on pedestrian pathways to 50 lux on the main dual carriageway.

Check "STANDARDS FOR INTEGRATED STREET LIGHTING PROJECT FOR DELHI"

http://www.delhitransco.gov.in/energyefficiency/lighting%20standards_rev_1.pdf

55 pages

The lamp fitting (luminaire) suppliers always give a contour diagram showing lux levels with their fitting at various heights. These have been measured with a luxmeter and plotted as you would a graph. It's not constant but starts with say 50 lux below the fitting and then a circular ring marked 40 lux, another at 30 lux and so on to zero. Different types of lamp and fitting give different patterns of lighting, a good catalogue will make this clear.

We used to design with an overlap so that say 25 lux from one street light added to the 25 lux from the next one. It's up to the designer to arrange to meet the minimum lux level required by the client.

So if you want 50 lux immediately below the lighting column which is 9 metres high, you need to select a lamp and fitting which will give you this lux level. Fairly standard lamp sizes and types are High pressure sodium at 125w, 150w, 250w and 400w, then there are metal halide and latest LED panels, which are twice as efficient as any conventional light source.

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#17
In reply to #14

Re: Street Lighting

06/17/2011 2:10 AM

light should be enough to see a fallen coin and pick it up.

Also light post installation and after 6 months will not be same. So keep margin.

To start with ,should be able to pick up a matchstick from floor/road.

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Guru

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#19
In reply to #17

Re: Street Lighting

06/17/2011 10:26 AM

Who carries match sticks?

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