Although ordinary traffic lights seem to be just colored light sources, their core performance is completely dependent on specialized traffic light LED chips that ordinary lighting LEDs cannot replace. From the chip selection, wavelength, brightness, weather resistance, heat dissipation, every aspect meets strict industry norms. Below you’ll find a detailed breakdown of the core considerations for these traffic light beads.
Wavelength Precision and Visibility
First, there’s the wavelength of light, the simplest and the most basic of necessities for traffic lights. National standards clearly state that the main wavelength for red LEDs is 620-625nm, green 500-504nm, yellow 585-590nm. Any small change in wavelength will greatly diminish the power of vision at great distances. Red light of short wavelength will appear orange and will not be easy to see in a bright light. Green light of long wavelength will appear whiteish and will not penetrate well in rain and fog. Traffic light beads on the market are low-priced but are cost-cutting, resulting in large fluctuations in the wavelength range, low visibility at night and in backlit conditions and a high risk of road safety hazards. Standard traffic signal LED chips shall be in a precise wavelength band and shall be precisely packaged.
Brightness Control and Uniformity
The traffic lights should not be so bright and glaring, nor so dim as to be readily seen. Each LED bead is calibrated individually for beam angle and brightness. The conventional traffic LEDs have a typical beam angle of 30° or 45°, which makes a batwing-wing beam pattern with a mask to make a uniform brightness in a 50-200 meter road range. The LED beads are of poor quality, and the brightness is uneven. There are bright spots and dark areas at the intersections. The signal is not easy to see for drivers at long distances. Meanwhile, the LED beads should be low flickering, adopting high-frequency constant current drive and special traffic light beads to avoid visual fatigue during long-time driving, which is not possessed by ordinary decorative LEDs.
Weather Resistance and Anti-Aging
Important for outdoor use are weather resistance and anti-aging. The road traffic lights are exposed to sunlight, rain and large temperature variations throughout the year. Silicone encapsulation of the LED beads is fully sealed with a high yellowing resistance colloid. The light decay rate of qualified traffic light beads is controlled within 5% per year, and the total life can reach more than 50,000 hours. The LEDs can withstand temperatures from -40℃ to +70℃, providing stable lighting in the harsh northern winter and hot southern summer without sudden decrease of brightness.
Heat Dissipation and Compatibility
Traffic signal LEDs generally use thickened copper brackets, which have much better thermal conductivity than ordinary aluminum brackets. Moreover, the LED voltage and current parameters are standardized to avoid individual LED burnout caused by overload. Some products of poorer quality use ordinary surface mount LEDs, which have poor heat conductivity and cause widespread damage within one or two years, resulting in a significant increase in road maintenance and replacement costs.
Safety Certification Requirements
The LEDs for municipal roads must be tested for optical and EMC electromagnetic compatibility, which guarantees no interference from stray light and no interference to the surrounding monitoring equipment. In conclusion, traffic signal LED chips are more than just colored light-emitting elements; optical, weather-resistant, heat-dissipating and electrical performance are all indispensable. Only the choice of compliant and dedicated traffic light LED chips can ensure long-term, stable, clear and safe signal indication.
Professional Purchasing Advice
When purchasing traffic signal lights, choose professional manufacturers, and pay attention to standard wavelength traffic signal LED chips that are waterproof, weather-resistant, with stable heat dissipation on aluminum substrates, low light decay, and long lifespan.Qixiang’s full units of traffic signals meet national standards and can be customized in size, solar-powered, or smart network-connected. We have our own production line, strictly control processes, provide comprehensive after-sales warranty, and offer one-stop supply for municipal engineerity.
Post time: Jul-15-2026
