Lux Level for Street Lighting

As per standard 30 lux is sufficient for exterior lighting,also check the uniformity,it is more important for street lighting.

regards

kamatchi

30-35 lux should suffice. However, you have to check the uniformity of illumination between the poles which further depends upon interpolar distance.

if distance between pole to pole is 10M even we should consider 30-35 lux kindly show me with one solved example

What is lumen output of your lamp?...it is important to calculate the lux level.

All the information you ever wanted or need is here

Let me give some information first and come back to lux level.

The street lighting is basically esential for the pedestrians and the vehicle drivers to see the obstructions clearly. The feature of the street lighting are:

There are no walls or ceilings to diffuse the light. The light reaching the surface of the road is direct from the lamps. The color rendering property is of minor importance. The hard shadows are difficulty to avoid.

As areas to b illuminated are large, same level of illumination as required for indoor lighting is not necessary for street lighting. The coninuous observation by the observer is seldom incase of street lighting.

Depending upon the two types of users namely pedestrains and vehicle drivers, the two principle are used in the street lighting namely diffusion principle and the specular reflection principle.

in diffusion priciple the light is directed downward from the lamps with the intension of producing a uniform illumination on the road surface. This is possible by use of suitably designed reflectors. The filament of the lamps is invisible except from almost beeath it. This eliminates glare. The road surface has adiffusing nature due to which it diffuses some proportion, of the light towards the observer. This makes the road surface bright for the observer.

in another case of specular reflection principle, the vehicle drivers require to see the obstruction 25 to 30 m away, on the road. When a ray of light falls on the road at a very high angle of incidence, the specular reflection takes place. The angle of incidence is the angle between the incident light and the normal to the surface. Such specular reflection is due to mat type of appearance of road surfaces. This light obtained by specular reflectoin gives proper brightness to the road.

Now Come to your Question:

The street lighting uses low illuminatin hence the eyes of observer are in their most senitive state and hence glare must be carefully avoided. The level of illumination depends on class of installation. Class A provides 2 lux while the last class H provides 0.1 lux. Class A is used in important shopping centers, road junctions etc. While class H is used in a poorly lighted suburban area. An average well lighted street has class C installation giving 5.5 lux. The actual value of illumination must be decided considering the condition of the road surface and considering wet and dry condition of the road surface.

So, I hope it will help you.

So how can one determine if 200W luminaire is sufficient to provide 35lux over an area of 90m square considering 10m poles distance specified??

https://cr4.globalspec.com/search/cr4search?query=street+lighting+calculations&newSearch=new