LED street light head advantages
1, the characteristics of the LED street lamp itself - the unidirectional nature of light, no light diffusion, to ensure the light power;
2. The LED street lamp head has a common secondary optical plan, and the light of the LED street lamp head is irradiated to the area of the required illumination, thereby further improving the illumination power to reach the energy saving intention;
3, LED light source power has now reached 90-110LM / W, and there is still a lot of room for development, the theoretical value of 250lm / W.
The luminous power of the high-pressure sodium lamp is added with the power addition. Therefore, the overall luminous efficacy LED street lamp head is stronger than the high-pressure sodium lamp; (this overall luminous effect is theoretical, in fact, the luminous efficiency of the high-pressure sodium lamp above 250W is higher than that of the LED ).
4, LED street lamp light color rendering is much higher than high-pressure sodium lamp, high-pressure sodium lamp color rendering index as long as 23, and LED street lamp head color rendering index reached 75 or more, from the perspective of visual thinking.
When reaching the same brightness, the illumination of the LED street lamp head can be more than 20% lower than that of the high-pressure sodium lamp (refer to the British lighting specification);
5. The light decay of the LED street lamp head is small, the light decay of less than 3% in one year, and the illuminance requirement of the road is still used after 10 years of use, and the high-pressure sodium light decays, which has dropped by more than 30% in a year or so.
6, LED is low-voltage equipment, driving the voltage of a single LED is a safe voltage, the single LED power of the series products is 1 watt
Therefore, it is a safer power source than high-voltage power supply, especially suitable for public places (such as: street lighting, factory lighting, car lighting, civil lighting, etc.)
7, long life: can use more than 50,000 hours, the shortcoming is that the life of the power supply is not guaranteed.
LED street light shortcomings
1. Single LED power is low. In order to obtain high power, multiple parallel connections are required.
2. Spots. Because of the shortcomings in the manufacturing process of the white LED itself and the cooperation error with the reflective cup or lens, it is easy to form a "yellow circle" problem.
3. Cooling. The lamp head is a high-power LED light source. The high-power LED has the problem that heat dissipation is difficult to handle, and the brightness will be significantly reduced after overheating, and the light decay is severe, so the power cannot be made too large.