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LED Street Light


      A factory in road lighting design project, through a detailed program of research and investigation, the whole plant road lighting for the project all use the LED light source.
The basic situation of the project are as follows:
(1)Project Location: North China.

(2)The total length of the road the whole plant: about 9km.
(3)Road width: 9m.
(4)Street light pole height: 8m.
(5)Street pick arm length: arm 1m.
(6)Street maximum spacing: 30m.
(7)Street layout: single-row layout.
      As a new type of light source, the initial application of industrial lighting project, we must make them
irreplaceable research, so the road lighting design, respectively, for the high pressure sodium lamp and LED light source. Contrast the different design of light source , we hope to get the truth results of the feasibility study.
Table 1 shows the design data, according to the data in Table 1 can be obtained from the illumination analysis and economic analysis respectively and get a reasonable conclusion.

Table 1
  LED Light Source High Pressure Sodium Lamp
Power 120W 250W
Power Factor 0.9 0.9
Average Lifespan 50000h 28000h
CRI 80a 40a
Street Llight Curve
Flux 10000lm 14000lm
The total number of street lights 273 273
Price 5260 3200

Illumination Analysis
Philips Philips Calculux Road software was used to make a street light design model, the report as following:

120W LED Street Light Illuminance Graphical Reports(Hill plane)

120W LED Street Light Illuminance Graphical Reports(Color Fill Figure)
 
250W HPS Street Light Illuminance Graphical Reports(Hill plane)

250W HPS Street Light Illuminance Graphical Reports(Color Fill Figure)
      According to the results of software analysis reports can be obtained illuminance value: 120W LED street light, light height 8m, 30m spacing in the next, on the road 9m wide, ground maximum illumination 51.8lux, minimum illumination of 12.8lux, average illuminance 25lux ; 250W high pressure sodium street light, light height 8m, 30m spacing in the next, on the road 9m wide, ground maximum illumination 60.3lux, minimum illumination of 12.1lux, the average intensity of 29.7lux. According to the industry and the national standards, the plant trunk roads must not drop below ground level illumination 10lux, so whether it is 120W LED street light or 250W high pressure sodium street light on the illuminance values meet standards.
Economic Analysis
According to Table 1 "LED light source, high pressure sodium light source design data comparison", Economic analysis can be obtained as shown in Table 2 results:

Table 2
  120W LED Street Light 250W HPS Street Light
Unit Price 5260 3200
Power 120 250
Average Lifespan 50000h 28000h
CRI 80a 40a
Energy Consumption A total of 273 sets of lights, according to the 10h / day computing
Total power Consumption / w 32760 68250
Daily Consumption / kWh 327.6 682.5
Annual Consumption / kWh 119574 249112.5
Operating Costs / 5 years 0.55 yuan per kWh
Purchase of Investment / million 143.6 87.36
Energy Costs / million 32.88 68.51
Lamp Replacement costs / million 0 2.73
Maintenance Costs (labor) / million 0 1.37
Total Cost / million 176.48 159.96
Carbon Dioxide Emissions / t 596.08 1241.83

      As can be seen from Table 2, due to the high price of LED street light, the first purchase costs are 40 percent more than high pressure sodium street light, less than half of high pressure sodium light source LED street light energy consumption costs higher, according to consider running for five years , LED light source is still higher than the total cost of high pressure sodium light source to nearly 10 percent. This shows that in the short term in the cost of LED lights still at a low level.
      However, in the interest of the economy at the same time, we can not ignore the rigid demands of energy conservation. From the international environment, climate change, energy security and other global issues highlights, low-carbon economic development has become the strategic high ground. From the domestic situation, the Chinese government promised that by 2020, carbon dioxide emissions per unit of GDP fell from 40% to 50% higher than in 2005, which also requires a strenuous effort. Meanwhile reduction targets established in the industry is also clear that the total amount of 5 million tons of standard coal to achieve energy "Twelve Five" period, the overall energy consumption yuan output value of industrial enterprises reached 5.8 percent decline. As can be seen from Table 2, the choice of LED lights in five years can reduce carbon dioxide emissions of more than 600 tons, equivalent to saving more than 240 tons of standard coal, although this more than 240 tons and 5 million tons of goals far, but a short step a thousand miles 500 tons goal is to accumulate up by a little bit of emissions, use of LED lights is the link which can not be ignored.