Advantage and disadvantage of led street light

Feb 20, 2019


Advantages of led street lights

1, Its own characteristics - the unidirectional nature of light, no light diffusion, to ensure light efficiency;

2, LED street light has a unique secondary optical design, the light of the LED street light is irradiated to the area of the required illumination, further improving the light efficiency to achieve energy saving purposes;

3, LED has reached 110-130lm / W, and there is still a lot of room for development, the theoretical value of 360lm / W, and the luminous efficiency of high-pressure sodium lamp is increased with the increase of power, therefore, the overall efficacy of LED street lights More powerful than high-pressure sodium lamps; (this overall light effect is theoretical, in fact, the luminous efficiency of high-pressure sodium lamps above 250W is higher than LED lights);

4. The color rendering of LED street lamps is much higher than that of high-pressure sodium lamps. The color rendering index of high-pressure sodium lamps is only about 23, while the color rendering index of LED street lamps reaches 75 or more. From the perspective of visual psychology, the same brightness is achieved, and the illumination of LED street lamps can be averaged. More than 20% lower than high pressure sodium lamps;

5, The light decay is small, the light decay of less than 3% in one year, still meets the road requirements after 10 years of use, and the high-pressure sodium light decays, which has dropped by more than 30% in a year or so. Therefore, the LED street lamp is designed to use power. Can be lower than high pressure sodium lamps;

6, LED street light has automatic control energy-saving device, can achieve the maximum possible power reduction under different lighting requirements, save energy, can realize computer dimming, time-segment control, light control, temperature control, automatic inspection, etc. Humanized function;

7, Long life: can use more than 50,000 hours, provide three years of quality assurance, the shortcoming is that the life of the power supply is not guaranteed;

8, High light efficiency: the use of chips above ≥ 100LM, compared to traditional high-pressure sodium lamps can save more than 75%;

9. Easy installation: no need to add cables, no rectifiers, etc., directly installed on the pole or nest the original lamp shell;

10, Excellent heat dissipation control: summer temperature control below 45 degrees, and passive cooling, summer cooling is insufficient;

11, Reliable quality: circuit power supply all use high-quality components, each LED has a separate overcurrent protection, no need to worry about damage;

12. Uniform light color: no lens is added, no uniform light color is sacrificed to improve the brightness, so as to ensure uniform light color without aperture;

13, LED does not contain harmful metal mercury, will not cause harm to the environment when it is scrapped.

The disadvantage of led street light

1. Single LED power is low: in order to obtain high power, multiple parallel connections are required;

2, Low color rendering: the color displayed under LED illumination is not true of incandescent lamps, which should be analyzed from the spectral distribution, which is a technical problem;

3, The spot: due to the defects in the manufacturing process of the white LED itself plus the coordination error with the reflective cup or lens, it is easy to cause the "yellow circle" problem;

4, LED illumination uniformity problem: If the secondary optical design is not carried out, the LED illumination is relatively concentrated, so the secondary optical design must be carried out, so that the light intensity distribution map is bat-shaped;

5, LED light fade problem: compared to low-power LED, high-power LED street light will have a much better light decay, but low-power LED heat dissipation is very small, and high-power LED is a problem that there is no way to solve the problem of heat dissipation, and After heating, the brightness will be significantly reduced, so the power can not be made larger. The biggest Spark LED street light sold in the market is 360W.