Many street lighting management offices in the city always think that the cost of
LED street lighting is high. Actually, we will give an example to see if the cost of LED street lamps is not high. Suppose a city has a section of road length of 3 kilometers. The street lamps are laid every 30 meters, and each side is calculated. The total number of street lamps required for these three sections is 202. The traditional street lamps are based on high-pressure sodium lamps with a power of 250W. LED street lights are compared with a power of 80W!
1, the cost of light source
The traditional street lamp unit price: 800 yuan / 盏, the cost of the light source for laying traditional street lamps is: 202 * 800 = 161600 yuan (excluding the light pole),
LED street lamp unit price: 2500/盏, the cost of light source for laying LED street light is: 202*2500=505000 (excluding light pole), (see Table 1)
2, the cost of laying cables
The traditional street lamp main line cable load flow I=P/U=202*250/220=230A, it needs cross-sectional area of 60mm2 *3 times=180 mm2 copper core cable (high-pressure sodium lamp instantaneous starting current is 3 times of normal lighting) Its unit price is 120 yuan / meter, then its cable cost is 120 * 3000m = 360,000 yuan. LED street light trunk cable load flow 1 = P / U = 202 * 80 / 220 = 73A, it requires a copper core cable with a cross-sectional area of 19mm2, it requires a copper core cable with a cross-section of 12mm2, unit price is 13 yuan / meter, The cable cost is 13*3000=39,000 yuan, compared with the situation (see Table 2)
3, one year's power consumption costs
The calculation method is to light up for 10 hours per day, and the power is calculated at 1 yuan per kWh.
The annual electricity consumption of a traditional street lamp of 3 kilometers is 202 (盏)*10 (hours)*365 (days)*250W=184325000w, that is, 184325 kWh, 184,325 yuan.
The total power consumption of LED street lamps in one year is 202*80*10*365=58984000W, which is 58984 kWh, RMB 58,984, compared with the situation (see Table 3):
4, light source life comparison
The street light source circulating in the market today: high-pressure sodium lamp, domestically produced due to quality and technical problems, short life, generally less than 3000 hours, the best imported Philippe, 3000-4000 hours, the life of single LED is more than 50,000 hours After the cluster becomes a super-power LED, its life span is more than 30,000 hours, which is equal to more than 5 times the life of the best high-pressure sodium lamp in circulation. That is, the high-pressure sodium lamp is replaced more than 5 times, and the LED street lamp is replaced once. Maintenance The cost and the resulting inconvenience are the most obvious contrasts. (Because the street lamp is special in use, it is difficult to replace, it takes a certain amount of manpower. Machine resources can be used to complete the operation)
Comparing the above three charts with the comparison of life and life, it can be seen that the LED street lamp replaces the traditional street lamp in the cost of the light source is not dominant, but in the laying cost, the LED street lamp can save the cost of the light source, and the electricity cost saved after use is the benefit. The benefits and disadvantages of their respective lifespans, the longer the road to be installed, the greater the cost savings. (The above does not include poles, installation, maintenance, etc., the cost of actually installing LED street lights is much lower than the installation. Traditional street lamp costs)
(Table 4) The following are road light sources. Electricity costs. Cable total cost comparison
The above is the comparison between LED street light 80W and high pressure sodium lamp 250W. With the improvement of LED street light technology, the advantage of LED street light is more obvious, and the cost can be recovered in the same year!
