1、The LED street lamps light has small decline, the decline in one year is less than 3%, even it used for 10 year, it is still can not reach the road illumination requirements. Therefore, LED lights when using the power of design can be lower than the high pressure sodium.
2、led street light bulb can be automatically dimming, and can achieve in meeting the different times of lighting requirements, the maximum possible reduction in power to save energy.
3、LED is a low-voltage DC devices. The single drive LED voltage is a safe voltage, so it is safer than the use of high voltage power supply, especially in a public place. DC characteristics of the LEDs are particularly suitable for combination with solar energy.
4、Each unit of LED die is only a small volume, so the device can be fabricated into various shapes, and it is suitable for variable shock environments.
5、long life: the theoretical life expectancy is more than 50,000 hours.
6、the LED can be frequently switch without worrying about its damage.
7、easy installation: directly to the led street light bulb poles to replace the original sodium lamp.
8、excellent thermal control: it can make LED junction temperature drops below 70 ° C . Withe the development of technology, the junction temperature still go further decline. In theory, the chips life will be longer.
9、the quality is reliable: the circuit power supply used in all high-quality components. Each LED has a separate over current protection and a string parallel protection, even if one is damaged, it will not lead to other LED chip failure.
10、LED light source does not contain toxic metals mercury, unlike the high pressure sodium or metal halide lamps which contain environmental harm.
However, recently, having heard the views of many experts and scholars, they think that the technology is not mature to replace high pressure sodium lamps. The main reasons are listed below:
1. LED luminous efficiency can not be compared to high pressure sodium.
2. The exposure of led street light bulb is too centered, so it has poor uniformity.
3. LED street lamps light has a serious decline, so life is not long.
4. LED street light weight is too heavy, so it is not easy to install.
5. High cost of LED street lights, so it is difficult to be universal.