Scientific data comparison between high-power LED street lamps and traditional high-pressure sodium lamp street lamps

Assume that a city has three sections of roads with lengths of 3 kilometers, 5 kilometers, and 10 kilometers respectively. If street lamps are laid at a rate of one lamp every 30 meters and one lamp on each side, the total number of street lamps required for these three sections of roads will be 202, 333, and 666 respectively. The traditional high-pressure sodium lamp street lamp is based on a high-pressure sodium lamp with a power of 250W, while our company's LED street lamp is based on a replacement with a power of 50W for comparison!

The unit price of traditional high-pressure sodium lamps is 1,000 yuan/lamp, and the unit price of LED lamps is 2,500 yuan/lamp. The cost of light sources required to lay three lengths of roads with traditional high-pressure sodium lamps is: 202*1000=202,000 yuan, 333*1000=333,000 yuan, 666*1000=666,000 yuan. The cost of light sources required to lay three lengths of roads with LED lamps is: 202*2500=650,000, 333*2500=832,500, 666*2500=1,665,000. The comparison is as follows

Traditional high pressure sodium lamp street light LED street light 3 km 202000 650000 5 km 333000 832500 10 km 666000 1665000 Next, let's analyze the cost of laying cables for two light sources on three sections of roads. The load flow of the main line cable of the traditional high pressure sodium lamp street light on a 3 km road is I=P/U=202*250/220=230A, and it needs a copper core cable with a cross-sectional area of ​​60mm2, and its unit price is 120 yuan/m, so its cable cost is 120*3000=360,000 yuan, and the load flow of the main line cable of the LED street light is I=P/U= 202*50/220=44A, and it needs a copper core cable with a cross-sectional area of ​​10mm2, and it needs a copper core cable with a cross-sectional area of ​​12mm2, and its unit price is 12 yuan/m, so its cable cost is 12*3000= 36,000 yuan, 5 km of traditional high-pressure sodium lamp street lamp trunk cable load flow I = P / U = 333 * 250 / 220 = 377A, it requires a copper core cable with a cross-section of 90mm2, the unit price is 180 yuan / meters, the cable cost is 980*5000=900,000 yuan, the load flow of the LED street light trunk cable I=P/U=333*50/220=73A, it needs a copper core cable with a cross section of 20mm2, the unit price is 25 yuan/piece, the cable cost is 25*5000=125,000 yuan, the 10-kilometer road traditional high-pressure sodium lamp street light trunk cable flow I=P/U=666*250/220=680A, it needs a copper core cable with a cross section of 400mm2, the unit price is 360 yuan/meter, the cable cost is 360*10000=3.6 million yuan, the load flow of the LED street light trunk cable I=P/U= 666*50/220=146A, it needs a copper core cable with a cross section of 42mm2, the unit price is 60 yuan/meter, and the cost is 600,000 yuan. The comparison is as follows Traditional high-pressure sodium lamp street light LED street light 3 kilometers 360000 36000 5 km 900000 125000 10 km 3600000 600000 Let's calculate the annual electricity consumption cost for three sections of road with two light sources. The calculation method is based on 10 hours of lighting per day and 1 yuan per kilowatt-hour. The annual power consumption of traditional high-pressure sodium lamps for 3 kilometers of road is 202 (lamps) * 10 (hours) * 365 (days) * 250W = 184325000w, that is, 184325 kWh, equivalent to RMB 184325. The total annual power consumption of LED street lights is 202*50*10*365=36865000W, that is, 36865 kWh, RMB 36865. The total annual power consumption of traditional high-pressure sodium lamps for 5 kilometers is 333*250*10*365= 303862500W, that is, 303863 kWh, RMB 303863 yuan, the total annual power consumption of LED street lights is 333*50*10*365=60772500W, that is, 60773 kWh, the total annual power consumption of traditional high-pressure sodium lamp street lights for 10 kilometers of roads is: 666*250*365*10=607725000W, that is, 607725 kWh, RMB 607725 yuan, the total annual power consumption of LED street lights is: 666*50*365*10=121545000W, that is, 121545 kWh, RMB 121545 yuan, the comparison is as follows Traditional high-pressure sodium lamp street lights LED street lights 3 kilometers 184325 yuan 36865 yuan 5 kilometers 303863 yuan 60773 yuan 10 kilometers 607725 yuan 121545 yuan Next, let's analyze the comparison of light source life. The street light source currently circulating in the market: high-pressure sodium lamps. Domestic ones have a shorter life due to quality and technical problems, generally less than 3,000 hours. The imported ones are best with Philips, reaching 3,000-4,000 hours. The life of our company's LED street lights is more than 50,000 hours, which is more than 10 times the life of the best high-pressure sodium lamps currently circulating. In other words, high-pressure sodium lamps are replaced more than 10 times, while LED street lights are only replaced once. The cost of replacing the light source is not low, and the maintenance cost and the many inconveniences caused by it are the most obvious comparison. (Due to the special use of street lights, replacement is difficult and costs a lot of money. It requires certain manpower and machine resources to complete the operation) From the comparison of the above three lists and the comparison of life span, it can be seen that LED street lights do not have an advantage in light source cost when replacing traditional high-pressure sodium lamps, but in terms of laying costs, LED street lights can save light source costs. The electricity bills saved after use are the benefits. There are also the advantages and disadvantages brought by their respective life spans. The longer the installed road, the greater the cost savings. (The above does not include the costs of poles, installation, maintenance, etc. In fact, the cost of installing LED street lights is also much lower than the cost of installing traditional high-pressure sodium lamps.) The following is a comparison of Traditional high-pressure sodium lamp street light LED street light 3 km 746325 yuan 577865 yuan 5 km 1536863 yuan 1018273 yuan 10 km 4873725 yuan 2386545 yuan The above is a comparison between our company's LED street light 50W and high-pressure sodium lamp 250W (the electrical box of the high-pressure sodium lamp is about 20W, that is, 250W=270W). The luminous efficiency of our LED street light is 100 lumens per watt, and the light decay is less than 3% per year, with a three-year warranty. If it works 10 hours a day, then 10*365=3650 hours. If it works 8760 hours a year, then the light decay per hour is 3/8765=0.0003. Then the actual light decay per year is 3650*0.0003=1.095. The national standard states that if the light decay exceeds 20%, it cannot be used. So the actual service life of our product is 20/1.095=18.3 years. Excluding the cost of energy-saving lamps, the cost of street lamps can be recovered within 1.5 years. Then there are 17 years of electricity bills to be earned. So no matter from which aspect, LED street lamps have a complete advantage in replacing traditional high-pressure sodium lamps.