Discussion: LED road lighting problem

- Aug 12, 2019-

The problem of LED street lamp serious light decay needs to be solved from the root of LED cooling technology.

Discussion on causes of LED road light failure

Temperature is actually the key problem of LED road lighting failure. LED street lamps are more powerful than household lamps, so manufacturers take great pains in the design of heat dissipation base plate fins and heat dissipation modules. After assembly, they need to add baking paint to protect the heat dissipation modules of lamps from climate erosion. The life of anodic treatment is not long, and it will oxidize and discolor after a little time. If the heavy industry is removed, it will not only consume time and labor, but also increase the maintenance cost. The protective cost of baking paint is low and the protective effect is good. However, generally speaking, baking paint has no heat dissipation function, and the paint itself will form a blocking effect, which is equivalent to increasing the thermal impedance of LED street lamp radiator.

LED road lighting failure solutions

To solve these existing problems, it is suggested that street lamp manufacturers start from the basic materials and fundamentally solve the problem of high-power LED heat source from the inside out.

Thermal resistance should be low to use thermal conductivity adhesive, recommended screen printing construction of soft ceramic thermal conductivity adhesive. The soft ceramic thermal conductive adhesive used in screen printing is different from the traditional laminating thermal conductive adhesive film. The soft ceramic thermal conductive adhesive is soft and semi-liquid. When the screen printing machine scraper is coated on the aluminum substrate, thermal conductive particles will penetrate into the pores of the substrate surface and fill up. This will form a completely flat surface with no pores, which will completely close to the LED lei substrate when it is bonded.

Soft ceramic heat dissipation paint is recommended for external protection of LED lamps. This spray-type soft ceramic heat dissipation paint can be directly sprayed on the outside of LED lamps, which is easy to operate and can adapt to various shapes of heat dissipation structure, and can also be adjusted into different colors to meet the needs of landscape design. The soft ceramic particles in the spraying heat dissipation paint are processed by nanometer. The fine particles are not only easy to be operated by the spray gun, but also make the heat conduction particles on the same coating area more and more dense, making the area of temperature volatilization and dispersion larger, so that the heat energy of LED lamps can be transferred out quickly.

Soft ceramic heat dissipation paint belongs to thermosetting material, in line with RoHS environmental protection and safety standards, the construction process is simple and does not need any special tools, after baking thermosetting, can withstand the high temperature of LED for a long time without qualitative change. LED street lamps, landscape lights, or LED advertising billboards used in the outdoors will also face wind and rain, acid rain guano, air dust, black smoke emission hELlip; And so on. Therefore, this spray type soft ceramic heat dissipation paint must have the characteristics of acid and alkali resistance. The current range of acid and alkali resistance is PH3~11, which can effectively protect the appearance of LED outdoor lamps from being eroded.

The cost structure of LED lamps has been improved with the progressive development of packaging technology, load plate design and heat dissipation module structure, and the quality has been continuously improved, while the cost has decreased with the development of technology and market demand. However, few manufacturers have invested in material improvement, which is mainly related to the history and habits of Taiwan's industrial and commercial development. Taiwanese manufacturers are good at manufacturing processes and design, with less emphasis on basic research and development of materials. Therefore, when it comes to solving technical problems or reducing costs, I tend to think in procurement or production management. However, American and Japanese manufacturers at the first time will consider from the application of materials, from the perspective of innovation to reduce costs, improve quality and increase profits.