Traffic lights (red and green lights) are a crucial component of urban traffic management, and their core light source is high-brightness, high-reliability LED chips. Different colors of traffic lights (red, yellow, and green) have different requirements for LEDs, making the selection of the right model essential.

highlight  Optoelectronics provides high-quality LED chips to traffic light manufacturers. We will analyze in detail the common sizes of traffic light LED chips, selection suggestions, and industry application standards to help you choose the right chips and ensure traffic safety.

Φ5mm (5mm diameter)  led  diode :
Features: Commonly used size in early traffic lights; small size, low cost, but relatively weak brightness and heat dissipation.

Applications: Some low-cost traffic lights or auxiliary indicator lights (such as countdown numbers).

Advantages: Inexpensive, suitable for projects with limited budgets.

Disadvantages: Lower luminous efficacy; prone to light decay over long-term use; gradually being replaced by larger LEDs.

546 Oval led  emmitting  light :
Features: Commonly used size in early traffic lights; small size, low cost, but relatively weak brightness and heat dissipation.

Applications: Some low-cost traffic lights or auxiliary indicator lights, advertising screens, underground traffic lights.

Advantages: Fast heat dissipation.
Disadvantages: Lower luminous efficacy, prone to light decay over long-term use, gradually being replaced by larger-sized LEDs.

3. 3528/3535/5050 SMD LED Chips (Surface Mount)

Features: Mainstream choice for modern traffic lights, high brightness, low power consumption, long lifespan.

3528 (3.5×2.8mm): Moderate brightness per chip, commonly used in low-power traffic lights.

2835 (3.5×3.5mm): Higher brightness, better heat dissipation, suitable for high-requirement traffic lights.

5050 (5.0×5.0mm): Common size, high brightness per chip, suitable for high-power LED traffic lights.

Applications: Most LED traffic lights worldwide (red, yellow, green), especially for scenarios requiring high brightness and high weather resistance.

Advantages: High luminous efficacy (100-150LM/W), energy saving.

Excellent heat dissipation and a lifespan of up to 50,000 hours.

UV resistant and high-temperature resistant, suitable for harsh outdoor environments.

Disadvantages: Compared to through-hole LEDs, surface mount technology (SMT) requires higher precision, but brands like Hailongxing Optoelectronics have optimized production to ensure stability.

4. COB LEDs

Features: Ultra-high brightness, suitable for large transportation hubs or special scenarios (such as tunnel signal lights).

Applications: A few high-end traffic signal lights or special lighting needs.

Advantages: Extremely bright, long viewing distance.