What is the application of LED tree light tunnel light in road lighting?

Updated:2022-08-22

Summary:

As the luminous flux of LEDs exceeds 100lm/W, LEDs are […]

As the luminous flux of LEDs exceeds 100lm/W, LEDs are gradually being valued as functional lighting, and many domestic and foreign manufacturers have conducted research on LED lamps. Although the effective luminous flux of LED road lighting lamps gradually meets the requirements of road lighting, LED is a new type of lighting source after all, and many researchers need to conduct in-depth research on it.

This time, three aspects of LED lamps for road lighting are mainly expounded and studied: lamp heat dissipation, lamp light distribution and lamp safety.
(1) Heat dissipation of lamps
Almost 20% of the energy of the LED chip is converted into light, while 80% of the energy is released in the form of heat, and the voltage, luminous flux, and light efficiency of the LED will decrease linearly with the increase of temperature. Therefore, how to effectively dissipate heat is the key to the development of LED road lighting, which mainly involves four aspects: conduction (material heat transfer coefficient, applied temperature, etc.), convection (convective heat transfer coefficient and ambient fluid temperature, surface heat flow), radiation (accelerating radiation). material), material properties (thermal stress-strain analysis, thermal fatigue analysis, thermally induced structural failure analysis, etc.).
For conduction: 1. Use fast heat transfer materials such as heat pipes, copper, aluminum, etc.; 2. Reduce interface thermal resistance.
For convection: 1. Increase the contact area with air; 2. Increase the heat capacity of the material; 3. Increase convection, etc.
For radiation: 1. The use of new radiation materials can increase the radiation efficiency of the radiator below 100 degrees.
For material properties: thermal stress-strain analysis, thermal fatigue analysis, thermal-induced structural failure analysis, etc. are mainly considered.
Considering the above factors, a more reasonable lamp structure (dual heat dissipation structure) can be designed.

(2) Light distribution of lamps
Due to the difference of roads, it is necessary to design lamps with different light distribution curves. It is not just one light distribution that can meet different needs.

(3) Safety performance of lamps and lanterns
In addition to conventional safety performance such as IP rating, EMI, EMC, withstand voltage test, etc., unsafe factors in practical applications should also be considered. There are three main types:

In order to dissipate heat well, the current LED road lamps often expose the LED radiator directly to the air. For the heat dissipation structure exposed to the air, conditions such as sand dust, bird droppings, acid rain, etc. are often encountered. During long-term use, especially in western my country, a large amount of sand and dust will continuously accumulate on the lamp housing. Although it is said that heavy rain can wash the lamp housing, it is found that the effect is not as good as we imagined in practical application. For lamps exported to foreign countries, a large number of birds are directly faced with the problem of resting on the lamp shell, and even settling down. For bird droppings, there is almost no heavy rain to wash them, which will directly affect the heat dissipation, life and beauty of the lamps. In addition, some companies use spray painting or coloring technology for the appearance of the lamp shell, which affects the heat dissipation, and under the erosion of acid rain, the lamp shell will appear rusty. In the summary of a large number of practical applications and continuous improvement and innovation.

LED lamps will gradually enter practical applications. For such a large market, quality will determine the final market share of LED-related companies.