Solar LED street light is made up of four parts: solar panel, controller, battery and light. Solar power and LED technic are the best combination for solar lights.

Sketch map of the Solar LED street light
Analysis on economic benefit and social benefit of Solar LED street light and normal high voltage sodium lamp.
The compare is under following statements:
The estimated construction of street light project includes 150 pieces lamps, design services life of 10 years, average lighting time is 8 hours each day, electricity rate is RMB0.5/KWH.
Economic benefit |
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|
High voltage sodium lamp |
Solar LED street light |
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Item |
Quantity |
Unit price(RMB) |
Sum |
Unit price |
Sum |
|
Lamps |
150pcs |
1500 |
225000 |
15000 |
2250000 |
|
Expense of high voltage cable material |
150sets |
260 |
2700000 |
0 |
0 |
|
Expense of low voltage cable material |
150sets |
3.5 |
26000 |
300 |
45000 |
|
10KV transformer box |
4sets |
20000.0 |
80000 |
0 |
0 |
|
Street lamp controller |
1pieces |
6000 |
6000 |
|
|
|
civil engineering |
150sets |
1200 |
180000 |
|
|
|
Expense of basic installation |
150sets |
1000 |
150000 |
1000 |
150000 |
|
Storage battery |
150sets |
0 |
0 |
|
|
|
Initial investment |
|
226.7 x 10000 |
|
244.5 x10000 |
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10years electric charge |
300W x 10h x 3650days x 150pcs x0.5/1000 = 820000 |
0 |
0 |
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Maintenance cost |
RMB150 x 10 years x 150pcs = 225000 |
0 |
0 |
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Wastage of lights |
RMB1500 x 150pcs = 225000 |
RMB1000 x 150pcs = 150000 |
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10years extra cost |
|
127x10000 |
|
15 x10000 |
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10years total |
RMB353.7 x1000 |
RMB259.5x10000 |
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|
|
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Social benefit |
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10 years with solar led lights these project will save 656 tons coal( according to 400g/KWH), means the reduction of emissions: SO2 31.6tons, CO2 486tons, NO2 23.6tons, CO 0.5tons, impurity and powder 276tons. |
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Relative to sodium lamp, solar led lamp has more advantages:
Item |
High voltage sodium lamp |
LED lamp |
Environmental protection |
Include Hg, ultra-violet radiation |
LED is green light source, |
Life |
Normal 3000hours, Philips can reach 3000-4000hours |
Real life can be more than 50000hours |
Light decay |
1 year 40% |
10years 30% |
Color rendering index |
About 20 |
>80 |
Luminous efficiency |
About 40% |
About 90% |
Starting time |
5-10minutes |
immediately |
Power supply system |
Needs Transformer |
Special drive module |
In order to fit the local actual situation, for a quotation we need following informations:
- Height of lamp pole?
- Power of LED lights or Luminosity of the center point?
- How many days should the lamp works in cloudy or rainy days?
- How many hours works the lamp(6hour, 8hours or 10hours)?
- If full bright / half bright can be acceptable?( e.g. from 18:00- 24:00 full bright, from 0:00-05:00 half bright)
- the local climatic conditions ?