Energy efficient Street Light Projects

About the Programme: Effective energy-efficient lighting design integrates efficient lamp technologies, optimum pole height and placement, efficient light distribution and aesthetics while using the least energy and meeting requirements for visibility and appropriate light levels ( NYSERDA, 2002)
The most common reason for inefficient street lighting system in municipalities & others are:

  • Selection of inefficient Luminaries
  • Poor design and installation
  • Poor power quality
  • Poor operation & maintenance practices

There is a tremendous potential to improve lighting quality while reducing energy use, costs, and GHG emissions-through energy-efficient retrofits for street lighting and improved operation and maintenance (O&M) practices.

Technologies Prevailing:

Type of Lamp

Luminous Efficacy (Lm/W)

Colour rendering properties

Lamp life in hours

Remarks

Metal Halide (MH)

70-130 Lm/W

Excellent

8,000-12,000

High luminous efficacy, poor Lamp Life

High Pressure Sodium vapour (HPSV)

50-150 Lm/W

Fair

15,000-24,000

Energy inefficient, Poor colour rendering

Low Pressure Sodium vapour

100-190 Lm/W

Very Poor

18,000-24,000

Energy efficient, very poor colour rendering index

Fluorescent Tube Light (T12&T8)

100-120 Lm/W

Good

5,000-10,000

Poor lamp life, medium energy use, only available in low wattage

Energy efficient Fluorescent Tube (T5)

100-120 Lm/W

Very Good

15,000-20,000

Energy efficient, long lamp life, only available in low wattage

Light Emitting Diode (LED)

70-160 Lm/W

Good

40,000-90,000

High energy savings, low maintenance, long life, no mercury, high investment cost, nascent technology