An important component of power consumption worldwide is street lighting. India is no different. Global trends in street lighting show that 18-38% of the total energy bill goes towards street lighting and therefore this is one domain that needs major attention if we look at improving efficiency of power consumption with an objective of saving energy.
Switching to LED lighting is a wise decision, as the incandescent lights are expensive and inefficient too.
Cheap LED street light = High Maintenance Cost
Streetlight is used for outdoor purpose. So power condition is very critical especially in India. Power Supply has to fight with worst power conditions such as lightning strike during rainy season. Outdoor power supply must have good surge protection and high voltage protection otherwise it may fail anytime.
Lumens/watt (Light output) of overall streetlight
Pole height should be according to wattage rating of streetlight :
Below 12 feet – below 15 watt
12-15 foot – 15-30 watt
15-20 foot – 30 to 50 watt
Above 20 feet – above 50 watt
The Kelvin Scale :
“K” is the abbreviated symbol for Kelvin’s. The Kelvin is a degree of temperature on the Kelvin scale, which is a scale used to measure the colour temperature of a light.
The Kelvin scale starts at absolute zero, referenced as 0K, which is around -273.15oC or -459.67oF. Each degree K above 0K is equal to the same in Celsius, e.g. 1oK = 1oC.
The lower the light temperature rates on the Kelvin scale, the ‘warmer’ and more red the light appears to the eye. The higher on the Kelvin scale a light rate, the ‘cooler’ and more blue the light appears.