Incandescent light began to appear in the 20th century, but it has been replaced by LED lights in the 21st century. Due to its unique characteristics, LED lights began to hit the lighting industry and are widely applied in many fields.

There are many applications for LEDs in commercial and household, but the LED technology applying in streetlight is the major one. Due to its energy efficient features and high intensity output, LED streetlights are being used in many countries, where the governments have started campaigns and are seriously making efforts to make LED technology popular as streetlights, and other application.


However, we have to face the reality that the glaring lighting will make us a bad visibility, especially the blue LED lights. For example, the scattered glaring LED lights will wash out the sight of the natural beauty of the sky, moon or stars.

For many LED manufacturers, in order to make more profit in the price competition, they will sell more cheap streetlights with bluish glare. When the LED streetlights are equipped in the street, they will create glaring lighting for pedestrians and drivers, which has a very bad effect on people and environment. What’s more, some governments who want to start campaigns of replacing all streetlights with LED lights, prefer focusing on cost-effectiveness of using LEDs rather than the color ambience. The bluer the output, the greater the intensity perceived by the eye. People often feel uncomfortable with the blue lights, especially the blue-rich color mix like moonlight or bright daylight. Glaring LED lighting is another reason why people resent the kind of LED lights. When air scatters blue light more than other color, making the night sky so bright it washes out the stars. According to the survey, blue light can also suppress melatonin production in humans and animals, affecting sleep and behavior.

Some scientist consultant suggested that manufacturers should add phosphors that converted most of the blue light into yellow and red to give a glow similar to the warm white of an incandescent bulb, so as to reduce the harm to human body and environment. The governments should spread awareness about the right solution for the type of LEDs, minimizing the inconvenience for the pedestrians and drivers because of the inappropriate application of the streetlights. But most cities use LEDs at the brighter illumination recommended for the bulbs they replace, wasting energy and increasing the negative impacts.

In order to balance the trade-offs between energy efficiency and environmental impact before outdoor LEDs get any bigger, we should get better LEDs.