1.The principle :
Intelligent LED street lamps fully consider the actual situation of urban road lighting, the use of single-chip microcomputer control technology for dynamic intelligent management of street lighting, humanization of street lamps. Because LED street lamps have the characteristics of extremely fast transient response that other street lamps do not have, it is easy to use khz-level pulse width modulation (PWM) mode to adjust the duty cycle of LED street lamps. (for example, when 0.5ms is bright and 0.5ms is off within 1ms, its brightness is 50% of the full brightness), the overall luminance of lamps is adjusted. Working at such a high frequency does not cause stroboscopic phenomena. By setting the lamp, the lamp can maintain a strong illumination during busy periods, and start to automatically adjust the light when there are few people in the car at the end of the night, so that the lamp can maintain a low illumination. In addition, according to the prosperity of different cities, lighting conditions and traffic flow, the built-in programmer can be used to set the mandatory illumination level and the time-length ratio of strong and weak illumination, so that street lamps can be periodically executed in accordance with the new Settings. That is, the realization of personalized local road lighting.
In addition, LED street lamp light source (LED) has a good single direction, and the light removal rate is very high, while the traditional gas street light source is omni-directional, relying on the reflective cover to gather a single direction of light, the loss is large, and the light removal rate is much lower than LED street light. Therefore, the actual light efficiency of traditional street lamps on the road is obviously inferior to LED street lamps. The predictability benefit analysis compares the economic benefit of 700 street lamps laid in 10 kilometers. The economic benefit analysis below is an ideal analysis. In fact, it can be seen from the 15 and 16 items in the technical parameter table that the advantages of LED street lamps are far beyond the ideal analysis.
3.Cable cost algorithm: 10 km of traditional street lamp cable current I=700*250W/220V≈800A, needs section 400mm2 copper cable, the unit price is 360 yuan/m, the cable cost is 360*10000= 3.6 million yuan, LED street lamp cable current I=700*50W/220V≈150A, needs section 40mm2 copper cable, the unit price is 60 yuan/m, the cost is 600 thousand yuan
Power consumption cost: the calculation method is to light the lamp for 10 hours per day and calculate it at 0.65 yuan per KWH. The total annual electricity consumption of traditional street lamps is 700*250W*365*10h*0.65≈415187(KWH) KWH, and the total annual electricity consumption of LED street lamps is 700*50W*365*10h*0.65=83037(KWH) KWH.
Light source life comparison, the traditional street lamp 3,000-4,000 hours, LED street lamp life in more than 40,000 hours, equal to the current circulation of the best high-pressure sodium lamp more than five times the life, high-pressure sodium lamp replacement more than five times, LED street lamp replacement, if the light source cost, maintenance and so on. From the above analysis, it can be seen that the longer the road is installed, the more cost-effective the traditional street lamp and LED street lamp will be.
With the continuous development of LED technology, LED cost performance continues to rise, LED light source gradually replace various traditional lighting sources to achieve semiconductor green lighting is not far away!
City roads, sidewalks, plazas, schools, parks, courtyards, residential areas, factories and other places that require outdoor lighting.