November 24, 2023

Heat Dissipation Design Suggestions for LED Wall Washers – Enhancing Reliability and Longevity

Achieving effective heat dissipation is crucial for maximizing the reliability and lifespan of LED wall washers. In this comprehensive blog, Win-E Illumination will delve deeper into the key considerations and design suggestions for optimizing heat dissipation in Wall Washer LED, ultimately enhancing its overall performance and longevity.

1. Addressing Chip Heat through Heat Sink and Radiator:

One of the primary challenges in heat dissipation design is effectively managing the excess heat generated by the LED chip. This can achieved through the strategic implementation of heat sinks and radiators. These components play a vital role in dissipating heat away from the chip, preventing overheating, and ensuring optimal performance.

2. Heat Dissipation Considerations for Power LEDs:

Power LEDs used in LED wall washer lamps require special attention to heat dissipation. A power LED is one that operates at a current greater than 100 mA. To improve the reliability and lifespan of power LEDs, addressing heat dissipation is of utmost importance. By employing efficient heat dissipation techniques, the temperature of power LEDs can be effectively controlled, mitigating the risk of premature failure.

3. Key Parameters for LED Heat Dissipation:

A. Thermal Resistance:

Thermal resistance is a crucial parameter that indicates the level of heat dissipation in an LED device. A device’s useful temperature is the difference between the external reference point’s temperature and its steady-state power consumption. High-quality LED wall washers with superior heat dissipation capabilities typically have a thermal resistance below 10℃/W. Lower thermal resistance values, such as below 5℃/W domestically and below 3℃/W internationally, ensure longer LED lifespan and improved reliability.

B. Junction Temperature:

Junction temperature refers to the temperature of the semiconductor junction in the primary heating area of the LED device. It is a critical factor that determines the LED’s performance and its ability to withstand operating conditions. To address this aspect, progressive thermal resistance guidelines are being developed to provide guidance on maintaining optimal junction temperatures.

C. Temperature Rise:

Temperature rise, specifically shell-shell temperature rise, measures the temperature difference between the LED device’s shell and a specified condition, such as the light-emitting plane located 0.5 meters away. This measurement directly affects the peripheral heat dissipation level of the LED device. A temperature rise of around 30°C, ensuring a measured LED tube shell temperature of 60°C, is considered satisfactory for optimal LED device lifespan.


Efficient heat dissipation design is crucial for enhancing the reliability and longevity of LED wall washers in Win-E Illumination. By proactively addressing chip heat through the implementation of heat sinks and radiators, considering heat dissipation for power LEDs, and understanding key parameters such as thermal resistance, junction temperature, and temperature rise, Win-E Illumination’s LED wall washers can deliver improved performance and extended lifespan. Incorporating effective heat dissipation strategies ensures the optimal functioning of LED wall washers, making them a reliable lighting solution for various applications.