Original lighting solution
Originally, there were 34 units of cassette tube lights 4x18W in the hardware shop. There were 4 tubes installed in each light, input of every light was 100 W.
Total input was 3,400 W (34 units x 100 W).
On average, the lights were on 5 days a week, 11 hours a day. Therefore, approx 9,724 kWh (5 days x 11 hours x 52 weeks x 3 400 W/1,000) were consumed by the shop lighting system during a year.
If we would consider 0,2 EUR/kWh to be an average energy rate, the customer would pay the annual costs as following:
- energy costs – 1,944.8 EUR
- maintenance costs – 50 EUR
- total costs – 1,994.8 EUR
New lighting solution
In order to substitute the 34 cassette lights we designed a new cost saving solution consisting of 16 LED Panels 60 x 60 cm 40 W installed into the coffered ceiling.
Total input was 640 W (16 units x 40 W).
Therefore, approx 1,830.4 kWh (5 days x 11 hours x 52 weeks x 640 W/1,000) were consumed by the shop lighting system during a year.
If we would consider 0,2 EUR/kWh to be an average energy rate, the customer would pay the annual costs as following:
- energy costs – 366.08 EUR
- maintenance costs – 0 EUR
- total costs – 366.08 EUR
Saving achieved
Return on investment is 0.8 year.
Annual energy costs saving is 1,578.72 EUR.
Annual maintenance costs saving is 50 EUR (LED Lighting solution is maintenance free and its operation time is more than 50,000 hours) Total annual saving is 1,628.8 EUR.
Total cost savings during the LED Light operation time (approx 17 years) is more than 35,000 EUR. Total CCO2 emission reduction during the LED Light operation time is 82.8 tonnes.
Comparing the original solution vs. new solution
| Original solution | New solution | |
|---|---|---|
| Input per unit | 100 W | 40 W |
| No. of Lights | 34 units | 16 units |
| Total input | 3,400 W | 640 W |
| Energy costs per year | 1,944.80 EUR | 366.08 EUR |
| Maintenance costs per year | 50 EUR | 0 EUR |
| Saving per year | – | 1,628.80 EUR |
