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Design Criteria for Street Lighting
 
IS 1944 (Part I & II) 1970, code of practice for lighting of streets to achieve required and uniform illumination. Well-designed lighting system improves the ambiance, safety and security. Lighting design can be determined by the function of the area. It is very important to look after all practical and theoretical data before deciding lighting fixture for street lighting. Proper design can save lot of energy and money by giving optimal solution.

• Safety and Security

   o What is current lighting level?
   o What is required lighting level based on the location?
   o What is the width of the street?
   o What is pedestrian conflict for the road?
   o How many intersections and curves are there?
   o What is the traffic volume on the street?
   o Are there any hospitals, schools on the road?
   o Are there any sidewalks on the street?

• Economic and Infrastructure Development

   o What type of lighting fixture is being considered based on the type of road?
   o Is Remote controlling system, timer, and dimmer options being considered?

• Functional area and requirement

   o Traffic Streets
   o Highways
   o Pedestrian Walkways
   o Emergency Vehicle Routs
   o Interior Streets
   o Roads near to School
   o Parking lots
   o Service roads
   o Special Areas

Based on the criteria mentioned in all three categories, basic parameters of lighting design can be evaluated.

• Height of the Pole
• Distance between two poles
• Boom Angle (Arm angle)
• Colour of the Light
• Average Lux level required
• Uniformity

Classes of Lighting Installations as per IS 1940 (Part I & II), 1970

1) Avg. Luminance = 30 Lux
2) Avg. Luminance level = 2CD
3) Overall Uniformity, L min / L avg. = 0.4
4) Maintenance Factor = 0.7 (Depends on IP of Luminary)
 
Type of Classes Required Lux Level
Group A1 - For every important route with rapid & dense traffic, where the only considerations are safety & speed of the traffic & the comfort of drivers. 30 LUX
Group A2 - For other main roads with considerable mix traffic like main city streets, arterial roads & thoroughfares. 15 LUX
Group B2 - For secondary roads with considerable traffics, such as principal local traffic rules, shopping streets etc. 8 LUX
Group B2 - For secondary roads with lighter traffic. 4 LUX
 
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