What is the important role of LED traffic signal lights?

Release Date:

2021-09-22

　　Traffic signal LED indicator light These are signal lights that use LEDs as the light source, typically comprising multiple LED emitters. The patterned-lens design allows for flexible layout adjustments, enabling the LEDs themselves to form a variety of patterns and to combine multiple colors and signal sequences. As a result, the same luminaire housing can convey more traffic information and support a wider range of traffic control strategies. Moreover, because LED light sources do not require narrow-band, monochromatic light or optical filters, nearly all of the emitted light is effectively utilized, thereby making conventional, rigid traffic signals more user-friendly and visually dynamic—features that traditional light sources cannot achieve.

　　

LED indicator light

 

　　LED indicator lights use LEDs as the light source, offering lower power consumption and greater energy efficiency compared with traditional light sources such as incandescent and halogen lamps. In addition, with a lifespan of 50,000 hours—25 times that of an incandescent lamp—LEDs can significantly reduce the maintenance costs of signal lights.

　　I. Product Features of LED Indicator Lights:

　　1. Low-grade fever:

　　LEDs directly replace traditional light sources, generating very little heat—almost no heat at all. LED indicator light The cooled surface can prevent injuries to maintenance personnel.

　　2. High visibility.

　　LED indicator lights maintain excellent visibility even under adverse weather conditions such as continuous illumination, overcast skies, fog, and rain. This characteristic of LEDs addresses the issues of visual illusions—commonly referred to as “false displays”—and color fading that plague traditional signal lights, thereby enhancing lighting performance.

　　3. Energy Conservation:

　　LED light sources offer significant energy-saving advantages, with their low power consumption being one of their most prominent features. Nearly 100% of the electrical energy consumed by an LED indicator is converted into visible light, whereas in an incandescent bulb, 80% of the energy is lost as heat, leaving only 20% as visible light.

　　4. Environmental Adaptability:

　　Outdoors, one must endure not only the cold but also the heat. LED traffic signals are immune to filament-related oscillation-induced damage, and their glass lenses remain unbroken.

　　5. Short color transition time:

　　 LED indicator light It can shorten the switching time for multi-color traffic signals. Because this type of bulb responds more quickly than conventional bulbs, it can help reduce the occurrence of traffic accidents.

　　II. Optical Design Methods for LED Indicator Lights:

　　1. Design Concept

　　Based on the specified design requirements, select LED light sources that are highly concentrated, exhibit high brightness, have a narrow beam angle, and deliver stable performance.

　　2. Structure

　　The pillowcase lens assembly can be used as an optical mask; given the dust-proof performance of optical masks, the smooth surface of the pillowcase lens array should be oriented outward.

　　3. Materials

　　When selecting materials, key considerations include internal stress, refractive index, light transmittance, temperature resistance, and ease of processing; polycarbonate (PC) with high light transmittance is a suitable choice.

　　4. Design Process

　　To enhance the collimation of light emitted by LEDs, the Fresnel lens must be optimized in its design. Furthermore, to meet the desired beam divergence angles in both the horizontal and elevation directions, the lens surfaces for these two axes must be designed separately. This involves using software to configure the lens as a meniscus lens and then performing iterative optimization to ensure that the design specifications are satisfied.

 

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