Citizens and municipalities in many cities around the world have recently requested that only outdoor LED lighting with warm color temperatures be installed. This is also supported by related organizations that have always supported limiting color temperature, such as the International Dark Sky Association.

Regarding this situation, the American Lighting Engineering Association (IES) stated that it is conducting intensive research on the color of LED lighting in order to make drivers and pedestrians safer during night road traffic.

Shirley Coyle, chairman of the American Lighting Engineering Association, said that even if the actual problem is related to poor lighting design or poor lighting design, it seems that some parties will only blame the lighting color. After the installation of some advanced LED devices, there will be no complaints. However, whenever there are more complaints, it is often about the color difference between the original high-pressure sodium (HPS) lamp and the LED.

In some cases, these differences have been pushed and widened by those who prefer warmer color temperatures. Shirley Coyle pointed out that some people blamed the color temperature of outdoor lighting for disrupting circadian rhythms, ignoring other important aspects such as light intensity, light source exposure time, and time period.

She said that the personal preferences of customers will vary from application to application. Generally, in the community, warm street lights with 3000K color temperature will be selected, and roads and highways will choose 5000K / 6500K color temperature lamps.

In addition to choosing a color temperature suitable for customers and applications, it is also important to use well-designed glare-reducing lamps. Another important task is to ensure that the lighting design meets the IES minimum standards to limit light intrusion and meet customer requirements.