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LED Street Light Cost Savings Calculator
Number of lights installed 2000
Price per KWH for electricity (Note 1) 0.20
Average number of hours of use per day 10
....................................................................Normal light Sodium bulb LED light
Number of lights 2,000 2,000 2,000
Price per KWH for electricity 0.20 0.20 0.20
Number of hours of use per day 10 10 10
Maintenance cost per light per year 450 220 0
Average lifetime (hours) of replacement lamp 2,000 16,000 60,000
Watts consumed per lamp 250 150 100
Total electricity cost per year for 2,000 lamps 365,000 219,000 146,000
Total maintenance cost per year for 900,000 440,000 0
Total cost per year (at current prices) 1,265,000 659,000 146,000
Average lifetime for each light (in years) 0.55 4.38 16.44
Total electricity and maintenance costs during lifetime of 2,000 lights (at current prices)
.........................................................................20,794,521 10,832,877 2,400,000
C02 Emissions in tons per year (Note 2) 0.365 0.219 0.146
Comparison of savings in electricity, maintenance, and CO2 emissions.
...........................................................Sodium lamp LED lamp LED lamp
............................................................vs Normal lamp vs Normal lamp vs Sodium lamp
Savings in Euro per year 606,000 1,119,000 513,000
Savings in Euro during total lifetime 9,961,644 18,394,521 8,432,877
Percentage savings 48% 88% 78%
Reduced CO2 emissions (tons per year)0.15 0.22 0.07
CO2 annual reduction percentage 40% 60% 33%
ROI
........................................................................LED vs normal light LED vs Sodium light
Price per LED lamp (single unit) 500 500
Total investment for 2,000 LED Lamps 1,000,000 1,000,000
Total savings per year 1,119,000 513,000
Total savings over lifetime of light 18,394,521 8,432,877
Payback period on investment (years) 0.89 1.95
Note 1. All costs in this example are based on actual 2009 prices in Euro.
Note 2. CO2 emissions are caculated on electricity consumption alone. Reduced vehicle journeys will yield additional emission savings.
