Industry News

Why some LED street lights turn purple?

Views : 331
Author : Admin
Update time : 2023-12-20 09:53:45

Do you know why some long neglected LED street lights suddenly turned purple one day?

This phenomenon might seem weird but innocuous. After all, what harm could purple streetlights possibly do other than scare nearby residents as Christmas approaches? 

A purple street light in a residential area

How do white LED street lights work?

LEDs (light-emitting diodes) are one of the most energy-efficient lighting technologies that currently exist. They also tend to be more durable and longer-lasting than other types of lighting while producing light that is comparable or better in quality.

These diodes can emit light at a variety of wavelengths—but one color they do not produce naturally is white. So when you see white LEDs, such as those in streetlights, they are actually emitting some mixture of the RGB(red, green and blue) colors, which together produce the appearance of white. 

There are two popular ways to create this white light. One is to combine tiny LED lights that each emit red, green or blue into a single big device. The other is to use only blue LEDs but coat them with a type of fluorescent substance called phosphor. When the blue light from the LED goes through this layer, the phosphor absorbs some of the blue wavelengths and spits out red and yellow ones. This results in a mixture of colors that, once again, appears white. The second method gained popularity because it's more energy-efficient and lower costly than the first. 

Why some LED street lights turn purple?

Now we can roughly guess the reason for the purple color. The phosphor coating around the LED has been delaminated (or peeled off, failed) exposing the blue LED light underneath. So the mixture light turn purple or indigo blue.

What are the hazards of purple street lighting?

Purple streetlight isn't good for driver or pedestrian safety. Blue- and violet-saturated light can worsen people's ability to see details because of the lack of blue-sensitive cones in the center of the retina. The blue-purple light makes it very difficult to distinguish between different colors, everything becomes a shade of blue or black. 

So, the municipal government should immediately replace these purple street lights, although some people still prefer this kind of ambient lighting. If these lighting fixtures have already passed the warranty period, then this will be a significant expense. Realshine company's LED street lights come with a 5-10 years warranty, which is your best choice. Free you from the trouble of replacing purple damaged streetlights.

Related News
Read More >>
Lighting control protocol what is 0-10V dimming Lighting control protocol what is 0-10V dimming
May .13.2024
In concept, 0-10 Volt dimming is one of the oldest and, in some ways, most simplistic form of dimming, it is a lighting control technique that enables you to adjust the brightness of a light source by regulating the voltage supplied to it.
Lighting control protocol: what is PWM dimming? Lighting control protocol: what is PWM dimming?
May .13.2024
PWM is a lighting control method by reducing the average deliverable power of an electrical signal. The basic principle of pulse width modulation (PWM) dimming is to apply a series of electrical pulses to the LED driver circuit, where the width, or duration, of each pulse determines the amount of time the LED is turned on.
Advantages of Lighting control protocol: DALI, 0-10V, DMX, and PWM Advantages of Lighting control protocol: DALI, 0-10V, DMX, and PWM
May .13.2024
Lighting control protocols not only enable you to achieve your desired lighting preferences but also provide numerous benefits such as enhanced energy efficiency, convenience, and Customizable Lighting.
Type and Structure of Led Panel Lights Type and Structure of Led Panel Lights
Apr .22.2024
The structure of edge-lit LED panel lights primarily comprises a frame, LED light source, a light guide plate, a diffuser plate, reflective film, a driver power supply, a back plate. Back-lit LED panel lights have a simpler structure, no light guide plate.