Original Lighting Solution
9 gas-discharge lamps (80 W each) were employed in village public lighting system. The total input of each light was 148 W including drivers.
Total 9 x 148 W = 1,332 W.
On average, the public lighting system worked 11 hours a day, 7 days a week, during a year period. Therefore, 7 x 11 x 52 x 1,332 = cca 5,333 kWh were consumed for the public lighting system.
Total energy costs for the main road lighting were 778.6 EUR per year, when 0.146 EUR/kWh is cosidered for an average energy cost.
New Lighting Solution
We suggested a saving alternative for our customer: to replace the 9 gas-discharge light units (80 W each) by 9 Lumis-LED Lights (24 W each) The total input of each Lumis-LED Light was 28 W including Mean Well drivers. Therefore, the main road lighting system requires 252 W .
The energy costs would be 7 x 11 x 52 x 252 x 0.146 = 147.3 EUR per year. The energy cost reduction would be 631.3 EUR per year, if our lighting solution would be implemented.
When counting the cost reduction, we have to involve maintanance cost decrease, too. Originally, the gas-discharge lamps with a 6,000 hours operation time were employed. Our LED solution is maintanance free and its operation time is approx. 80,000 hours. Maintanace cost saving is approx. 186.6 EUR per year (gas-discharge lamp price and the work price).
Total Lighting Cost Reduction
In this case, the total cost saving reaches 817.90 EUR per year, an amazing 85% saving. The Lumis-LED Lights operation time is approx. 20 years, total main road lighting cost saving is more than 16,350 EUR.
Comparing the original solution vs. new solution
|Original solution||New solution|
|Input per unit||148 W||24 W|
|No. of Lights||9 units||9 units|
|Total input||1,332 W||252 W|
|Energy costs per year||778.60 EUR||147.30 EUR|
|Maintenance costs per year||186.60 EUR||0 EUR|
|Saving per year||–||817.90 EUR|