Heat dissipation design impacts solar garden lights’ lifespan. Currently, due to the low output beam of a single LED for general lighting use, many LED components need to be placed in a module to achieve the required illuminance. Since the photoelectric conversion efficiency of LEDs is only between 15% and 20%, the rest converts to heat. Thus, placing a large number of LEDs on a single module increases the difficulty of thermal management.
The issue is that this heat will cause the temperature of the LED module to rise. As the temperature increases, it leads to a reduction in the drive voltage, a decrease in light intensity, and a shift in the wavelength of light emitted. Additionally, it affects the efficiency of LED drivers, damages magnetic components, and shortens the life of output capacitors, resulting in reduced reliability of the LED driver and significantly lowering the lifespan of the LED while accelerating the light decay of the LED lamp. Therefore, good heat dissipation design is mainly considered for the following reasons:
1) To improve the luminous efficiency of LEDs, increase current (power), and reduce the junction temperature (Tj) of the LED chip.
2) High optical performance and reliability of LEDs depend on the junction temperature (Tj) of the LED chip. Therefore, good thermal design is essential in managing the junction temperature of LEDs. The main methods for heat dissipation are conduction, convection, and radiation.
Among these, conduction and convection are particularly important for the heat dissipation of LED garden lights, while radiation is less significant. From the thermal analysis, when relative changes of UF and IF are small and when the efficiency of LEDs reaches the standard value, the heat (Q) equals the dissipated power.
If traditional lamp fixtures are modified for LEDs, although aluminum profiles are used as heat sinks and the entire light source and driver circuit are installed in an aluminum alloy lamp shell, which solves the issue of the protection level of the fixtures, the entire light source is enclosed within the lamp shell. The heat generated during the operation of the fixture cannot dissipate into the air, causing the LED module and driver circuits to experience drastically increased temperatures in extremely unfavorable environments. As the temperature rises, the LED may suffer light decay or even damage, while the driver also becomes damaged due to excessive temperatures, diminishing the reliability and lifespan of the LED fixture.
Bitpott solar garden lights manufacturers specialize in research and development, production, and sales of solar and LED outdoor lighting. With years of production experience and advanced manufacturing equipment, they guarantee quality, reasonable pricing, and configurations. For purchasing Bitpott solar garden lights or inquiries regarding pricing, please contact our online customer service. We welcome your calls to order!
