Hidden dangers of poor heat dissipation: chain reaction of LED street light lifespan, components, and materials
Release time:
2026-04-02
The heat dissipation design of LED street lights is often hidden inside the lamp housing, which is not easily perceived intuitively. However, once the cooling system fails or is poorly designed, the chain reaction it triggers will directly affect the reliability, safety, and economy of road lighting. This article analyzes the multiple hazards of poor heat dissipation from three dimensions.
Shortened lifespan: a vicious cycle of accelerated light decay
Poor heat dissipation directly leads to an increase in junction temperature of LED chips. According to the principle of energy conservation, not all of the electrical energy input by LEDs is converted into light energy - a considerable portion is converted into heat energy. Taking a typical LED street light as an example, 60% -70% of the input electrical energy is ultimately converted into heat. If the heat cannot be exported in a timely manner, the PN junction temperature will continue to rise, and the light decay process will be significantly advanced.
Taking traditional aluminum substrate street lamps as an example, the thermal bottleneck of their insulation layer leads to the accumulation of chip heat. When the surface temperature of the lamp is only 45 ℃, the internal chip may have reached above 80 ℃. Under long-term high-temperature operation, the attenuation rate of light output may increase by 2-3 times, and the originally designed lifespan of 50000 to 100000 hours may be shortened to 2-3 years. This means frequent replacement of lighting fixtures, significantly increasing municipal maintenance costs.
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