Led & Solar - Economics
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1. Sample Calculation on Lamp Replacement using LED Lamps
Assuming Average life per lamp 80,000 hoursType of LED | Cost to maintain per year |
| For office location replacement over ten years | 60p per lamp |
| For Car Park location replacement over five years | £1.40 per lamp |
2. Sample Calculation for Street Lighting
To lay power cable to new streetlights with available mains supply to end of road
Assumes Lamp spacing 40m.
Actions taken to lay powercable for new streetlights | Cost |
| Dig Trench 400 m per day 2 man team @ £14 per hour - | Cost per lamp £22 |
| Trenching Machine user per day £200 | Cost per lamp £20 |
| Cost of cable - £5 per meter | Cost per lamp £200 |
| Lay cable and back fill - 400m per day 2 man team | cost per Lamp £22 |
| Connection to Lamp post - 1 hour per lamp 2 men | cost per lamp £28 |
| Total cost per lamp | £ 292 |
| Cost of Electricity - 10 hours at 500W per night - 150kWhr per month | £12 per month |
| Additional Cost of Solar powered LED light unit | £500 |
Distance from nearest available mains supply to start of lighting section (or village) for 10 LED street lamps to be cost effective immediately - 0.75 km.
3. Sample Costs of Maintaining Fluorescent Lamps
Assuming Average Life of 7,500 hours
a) Office Location
Actions taken to replace fluorescent lamp | Time taken in minutes |
| Two phone calls from staff about failure | 10 |
| Scheduling into maintenance tasks | 5 |
| Maintenance draws together replacement lamp and suitable ladder | 10 |
| Go to location, move furniture and Replace lamp | 15 |
| Dispose of lamp properly, return ladder | 10 |
| Total time taken | 50 @ £12 per hour |
Replacement cost circa £5 per year / lamp
b) Car Park Location
Replacement cost circa £16 per year / lamp
Actions taken to replace street lamp (car park location) | Time taken in minutes |
| Time to go to location and return | 40 |
| Fix street lamp | 35 |
| Total time taken | 75 minutes every year @ £12 per hour |