Comparison of the cost of installing LED street light and traditional street light
2020-08-29
Compared with high-pressure sodium lamps, led street light has many advantages. Now the comparison of the purchase, installation and maintenance, and energy consumption costs of 90W LED street lamps and 250W high-pressure sodium lamps traditional street lamps is as follows:
1. Lamp purchase cost:
The market purchase price of a traditional 250W high-pressure sodium street lamp is around RMB 50; the purchase price of a 90W LED street light is around RMB 500.
2. Cable laying cost:
Assuming that there is a 3 km long road in a city that needs to be installed with street lights, the distance between the street lights is 35 meters per lamp, and a total of 86 street lights are installed on this road based on a single-sided calculation.
1. A 250W high-pressure sodium lamp for traditional street lamps (electrical power loss is about 10%, and the built-in capacitor compensation power factor is 0.85). Assuming that the power supply is in the middle, then the working flow of this traditional street lamp circuit-I = 86*250*(1 +10%)/1.732*380*0.85=42.3A, (at the same time to meet the voltage drop of the line), it needs to lay the copper core cable of VV-4*25+1*16mm2, the unit price of this cable is 104 yuan /M, the cable cost is 104 yuan/m*3000m=312000 yuan;
2. The working current of the LED street light circuit I=86*90/1.732*380*0.85=13.8A, the cable it needs to lay is a VV-5*4mm2 copper core cable, the unit price of this cable is 25 yuan/m, then The cable cost is 25 yuan/meter * 3000 meters = 75000 yuan.
3. Operational power consumption cost:
Taking the lights on for 10 hours a day and the unit price of electricity is 0.7 yuan/kWh, the annual power consumption of the two street lights is calculated as follows:
The annual electricity consumption of each high-pressure sodium lamp street lamp is:
250W*(1+10%)*10 hours/day*365 days=1003.75 degrees
The electricity fee is: 1003.75 kWh * 0.7 yuan / kWh = 703 yuan
The annual electricity consumption of each LED street light is:
90W*10 hours/day*365 days=328.5 degrees
The electricity fee is: 328.5 kWh * 0.7 yuan / kWh = 230 yuan
4. Maintenance cost:
The high-pressure sodium lamp light source circulating in the market today has a life span of 15000-20000 hours under a standard voltage working environment.
However, due to the large fluctuation of the working voltage relative to the standard voltage, the actual service life of the light source is less than 6000 hours (about 1.5 years).
The average service life of the ballast is about 2.5 to 3 years; while the single LED street light has a long life and low power consumption.
The LED can be used continuously for 50,000 hours, and the service life is more than 5 years. There is no need to replace the light source throughout the life. The traditional street lamp is replaced once.
Maintenance costs are high and will cause a lot of inconvenience (because most of the street lights are difficult to replace, it takes a certain amount of manpower, machine resources to complete the operation will also block traffic).
Light source life/year lighting time-5 years to replace electrical appliances-0.3-electrical life / annual working time-6-light source price (yuan)-100-LED street light have long life and low power consumption. The LED can be used continuously for 50,000 hours, and the service life is more than 5 years, without the need to replace the light source.
From the above comparison, it can be seen that the replacement of traditional street lamps by LED street lamps costs 450 yuan more in the purchase cost of lamps, and the cost of cable saving during installation is 2756 yuan. Therefore, the annual operating costs saved by using LED street lamps are the income. The longer the length, the greater the cost savings. (The above does not include electrical poles, installation and maintenance machinery and labor costs, etc., in fact, the cost of installing LED street light is much lower than that of installing traditional street lights.
1. Lamp purchase cost:
The market purchase price of a traditional 250W high-pressure sodium street lamp is around RMB 50; the purchase price of a 90W LED street light is around RMB 500.
2. Cable laying cost:
Assuming that there is a 3 km long road in a city that needs to be installed with street lights, the distance between the street lights is 35 meters per lamp, and a total of 86 street lights are installed on this road based on a single-sided calculation.
1. A 250W high-pressure sodium lamp for traditional street lamps (electrical power loss is about 10%, and the built-in capacitor compensation power factor is 0.85). Assuming that the power supply is in the middle, then the working flow of this traditional street lamp circuit-I = 86*250*(1 +10%)/1.732*380*0.85=42.3A, (at the same time to meet the voltage drop of the line), it needs to lay the copper core cable of VV-4*25+1*16mm2, the unit price of this cable is 104 yuan /M, the cable cost is 104 yuan/m*3000m=312000 yuan;
2. The working current of the LED street light circuit I=86*90/1.732*380*0.85=13.8A, the cable it needs to lay is a VV-5*4mm2 copper core cable, the unit price of this cable is 25 yuan/m, then The cable cost is 25 yuan/meter * 3000 meters = 75000 yuan.
3. Operational power consumption cost:
Taking the lights on for 10 hours a day and the unit price of electricity is 0.7 yuan/kWh, the annual power consumption of the two street lights is calculated as follows:
The annual electricity consumption of each high-pressure sodium lamp street lamp is:
250W*(1+10%)*10 hours/day*365 days=1003.75 degrees
The electricity fee is: 1003.75 kWh * 0.7 yuan / kWh = 703 yuan
The annual electricity consumption of each LED street light is:
90W*10 hours/day*365 days=328.5 degrees
The electricity fee is: 328.5 kWh * 0.7 yuan / kWh = 230 yuan
4. Maintenance cost:
The high-pressure sodium lamp light source circulating in the market today has a life span of 15000-20000 hours under a standard voltage working environment.
However, due to the large fluctuation of the working voltage relative to the standard voltage, the actual service life of the light source is less than 6000 hours (about 1.5 years).
The average service life of the ballast is about 2.5 to 3 years; while the single LED street light has a long life and low power consumption.
The LED can be used continuously for 50,000 hours, and the service life is more than 5 years. There is no need to replace the light source throughout the life. The traditional street lamp is replaced once.
Maintenance costs are high and will cause a lot of inconvenience (because most of the street lights are difficult to replace, it takes a certain amount of manpower, machine resources to complete the operation will also block traffic).
Light source life/year lighting time-5 years to replace electrical appliances-0.3-electrical life / annual working time-6-light source price (yuan)-100-LED street light have long life and low power consumption. The LED can be used continuously for 50,000 hours, and the service life is more than 5 years, without the need to replace the light source.
From the above comparison, it can be seen that the replacement of traditional street lamps by LED street lamps costs 450 yuan more in the purchase cost of lamps, and the cost of cable saving during installation is 2756 yuan. Therefore, the annual operating costs saved by using LED street lamps are the income. The longer the length, the greater the cost savings. (The above does not include electrical poles, installation and maintenance machinery and labor costs, etc., in fact, the cost of installing LED street light is much lower than that of installing traditional street lights.
