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In terms of lighting properties, there are four key technical points in LED street lights: light efficiency, light distribution, light decay and color temperature.In recent years, LED street light technology has changing with each passing day and the optical performance has been being improved constantly. At present, many newly released street lights not only have great improvement in light efficiency, but also have great enhancement in light distribution level. and the problem of light decay has also been significantly improved. Therefore,LED street lights have become the mainstream product of street lighting project.
In many key technical points, the CCT of led street lights have been controversial. Some people prefer cool white light of high CCT, while others prefer the traditional warm yellow light of low CCT. Street lights are "dimmers" at night in cities. Their color temperature determines the "background color" at night. and the change of color temperature is closely related to the daily life of citizens. No matter which color temperatures is selected, some people will dislike it.
These two colour temperatures of high contrast on street lights have been compared repeatedly. At first, it was a comparison between led street lamps as a new light source and traditional HPS street lamps. Later, with the continuous development of technology, many luminaire manufacturers put forward CCT optional led street lighting solutions.The comparison content has changed into the color temperature selection of LED street lights.
However, the root of the problem remains unresolved, and the choice of color temperature for street lamps remains controversial. Some people think that white light with high color temperature has intermediate visual effect when used in road lighting. It has good visibility and looks brighter. Others believe that yellow light is more fog-permeable, feels warmer and is more popular with the public than white light. The above statement, each has its logic and reason, also has certain rationality.
The practical application is the best test of the product and the best feedback of the product experience. The new demands reflect people's product expectations from their physiology and psychology. Physiological research mainly includes visibility, recognition ability and other indicators, which need to be acquired by researchers through carefully designed experiments. Psychological research mainly includes indicators such as comfort and satisfaction, and it is necessary to conduct situation survey and questionnaire survey on sufficient number of citizens.
Psychological feeling is a subjective feeling. Different individuals have different preferences for different color temperatures. There is no right or wrong in this cognitive dimension . So simply judging the merits of white light and yellow light is neither rigorous nor scientific.
LED street lights have the practical significance of large-scale use in road lighting. Color temperature option lighting solutions only address some people's preferences. Once the proportion of color temperature preference changes, the comfort and satisfaction of the public to the color temperature of street lights will also be affected. This may be followed by a series of complaints. However, it is clearly not feasible to retrofit all street lamps simply because of color temperature. Because the cost of refurbishment is huge, public money will be wasted.
How to adjust the color temperature according to the demand without too much cost has become a real problem in front of people. Color temperature adjustable street lighting solutions avoided people caught in the dilemma of choice.
The public facilities management department can flexibly adjust the color temperature of street lamps according to various circumstances and there is no need to renovate lamps at all. Different color temperatures can be set at different times of the day or in different seasons. It can also be adjusted according to the weather and public preferences.For example, when fog is heavy, the color temperature can be adjusted to a warm yellow light with strong fog penetration ability. When traffic is heavy, the color temperature can be adjusted to a cold white light with good visibility etc.
Color temperature adjustable lighting solutions are not only of great significance in street lighting applications, but may also be used in other areas of lighting in the future, even in industrial lighting.
