Specialists in LED & Solar Lighting

Led & Solar - Ecomonics

Sample Calculation on Lamp Replacement

Current Lighting

Fluorescent Lamps - Average Life of 7,500 hours (conventional)

Cost of replacing each failed lamp (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 per lamp

Cost of replacing street lamp (car park location) (24 hour operation)

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

Replacement cost circa £16 per year per lamp

LED Lamps

Average life 80,000 hours

Type 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

 

Sample Calculation - Cabling Street Lighting

Street Lighting Cabling – to lay power cable to new streetlights with available mains supply to end of road

Assume 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.