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Recently, the haze once again sweeping across the country, as the lighting enterprise, we can not change the environment, but can do small thing, so that people not can see only the lights but also the road when going out, Which requires increasing penetration of the LED street lights.
Color temperature selection of LED street lights
LED packaging process currently used through applying the phosphor with different excitation wavelengths, adjusting the amount or the proportion of phosphor to obtained white LED light source with different color temperature. Different light sources emit different color temperature, low color temperature light source is characterized by energy distribution, the red radiation is relatively more, usually called "warm light; After color temperature increasing, the proportion of blue radiation will be ncreased in the energy distribution, commonly referred to as "cold light." For white LED light, there is a relative more proportion in yellow for the low color temperature, however, there is a relative more proportion in blue for the high color temperature. From the human visual point of view, low color temperature gives a warm, stable feeling, and high color temperature gives a deserted, refreshing feeling.
The color temperature of some common light sources
In general, LED light sources can be divided into warm white, neutral white and cold white, three categories. The color temperature of traditional street lights are generally warm white light that about 2300K, the human eye vision will obviously feel yellow. LED can be produced different color temperature of the light source through the packaging process, give the road lighting a lot of different options.
The relationship between color temperature and light efficiency
It is noteworthy that, for the color temperature selection in the early group of LED lights, almost all manufacturers have chosen 6000K, or even more than 6000K, this is why? It turned out that under the technical conditions that the early phosphor, cool white LED light source with a higher light efficiency. Compared to color temperature, people pay more attention to the physical properties of light efficiency. The most important means to improve light efficiency is to improve the excitation efficiency of the phosphor, excitation efficiency of YAG yellow powder is much higher than the orange powder.
Higher color temperature can get higher light efficiency, light efficiency of 5500-6500K color temperature can enhance 48.7% than the warm white light source which less than 3500K. LED is energy-saving, entirely because the LED has a higher light efficiency than other light sources, put aside the energy efficiency and talking the energy-saving is meaningless.
High light efficiency not only bring higher energy efficiency, but also reduce the cost of lights, making the products more competitive. So most of the LED street light manufacturers select to producing the products with 6000K color temperature in order to pursue high energy-saving rate.
In recent years, LED technology is still high-speed developing, the light efficiency of chip continuously improve, energy efficiency rate has also been guaranteed. The contradiction between light efficiency and color temperature is no longer the main contradiction in the application process, and whether the color temperature and environmental conditions are coordinated is the focus should be paid attention. Synthesize technical conditions, climatic conditions, the current environmental conditions and the human eye senses, we propose, color temperature of LED street lights should choose the range of 3000 ~ 5700K. This color temperature will not have a large impact on light efficiency, but also to ensure the penetration of haze, and adapt to our people's visual senses.
Recently, the haze once again sweeping across the country, as the lighting enterprise, we can not change the environment, but can do small thing, so that people not can see only the lights but also the road when going out, Which requires increasing penetration of the LED street lights.
Color temperature selection of LED street lights
LED packaging process currently used through applying the phosphor with different excitation wavelengths, adjusting the amount or the proportion of phosphor to obtained white LED light source with different color temperature. Different light sources emit different color temperature, low color temperature light source is characterized by energy distribution, the red radiation is relatively more, usually called "warm light; After color temperature increasing, the proportion of blue radiation will be ncreased in the energy distribution, commonly referred to as "cold light." For white LED light, there is a relative more proportion in yellow for the low color temperature, however, there is a relative more proportion in blue for the high color temperature. From the human visual point of view, low color temperature gives a warm, stable feeling, and high color temperature gives a deserted, refreshing feeling.
The color temperature of some common light sources
In general, LED light sources can be divided into warm white, neutral white and cold white, three categories. The color temperature of traditional street lights are generally warm white light that about 2300K, the human eye vision will obviously feel yellow. LED can be produced different color temperature of the light source through the packaging process, give the road lighting a lot of different options.
The relationship between color temperature and light efficiency
It is noteworthy that, for the color temperature selection in the early group of LED lights, almost all manufacturers have chosen 6000K, or even more than 6000K, this is why? It turned out that under the technical conditions that the early phosphor, cool white LED light source with a higher light efficiency. Compared to color temperature, people pay more attention to the physical properties of light efficiency. The most important means to improve light efficiency is to improve the excitation efficiency of the phosphor, excitation efficiency of YAG yellow powder is much higher than the orange powder.
Higher color temperature can get higher light efficiency, light efficiency of 5500-6500K color temperature can enhance 48.7% than the warm white light source which less than 3500K. LED is energy-saving, entirely because the LED has a higher light efficiency than other light sources, put aside the energy efficiency and talking the energy-saving is meaningless.
High light efficiency not only bring higher energy efficiency, but also reduce the cost of lights, making the products more competitive. So most of the LED street light manufacturers select to producing the products with 6000K color temperature in order to pursue high energy-saving rate.
In recent years, LED technology is still high-speed developing, the light efficiency of chip continuously improve, energy efficiency rate has also been guaranteed. The contradiction between light efficiency and color temperature is no longer the main contradiction in the application process, and whether the color temperature and environmental conditions are coordinated is the focus should be paid attention. Synthesize technical conditions, climatic conditions, the current environmental conditions and the human eye senses, we propose, color temperature of LED street lights should choose the range of 3000 ~ 5700K. This color temperature will not have a large impact on light efficiency, but also to ensure the penetration of haze, and adapt to our people's visual senses.
In the background of high-speed development and energy-saving emission reduction of the LED lighting, more and more cities replace their street lights by LED lighting products, it is expected that the number of street lights will reach 350 million in 2025. Recently, which cities have opened the installation project of LED street lights?
Montreal, Canada, 132,000 street lights will be transformed into LED street lights.
It is reported that the city government of Montreal, Canada, will make a decision on replacing its 132,000 street lights with the LED light source products.
The city of Montreal has plans to replace its incandescent bulbs with more cheaper and more energy-efficient LED lighting products(mainly 4000K). However, considering that the high color temperature may bring health problems, the city people opposed to it. Many people like 3000K light source products in Toronto and Chicago.
Montreal Mayor said that despite the city government has not yet made a decision, but now the voice of giving up the 4000K is high. It is reported that once it is determined which color temperature to use, the city of Montreal may carry out the large-scale project bidding.
Singapore plans to replace the street lights of the country with LED street lights before 2022.
Singapore Land Transport Authority announced that they plan to replace the island street lights with more energy-efficient LED street lights before 2022, and adopt the new remote monitoring system, switch street lights according to weather conditions.
Singapore authorities have launched two pilot projects in the past, in some areas to test high power and general power LED street lights. They began to change the street lights into LED street lights in some areas from 2013, has been installed LED street lights for about 4000 street lights.
The Singapore Government Street lights Replacement Program will be carried out in three phases:
Stage one will cover 500 roads which are low-traffic and located in residential area, plan to completed by 2018.
The second stage, which is concentrated in the central region, it is expected to be completed by 2019.
The third stage, replacing the rest of the street lights project and it is expected to be completed before 2022.
The Uzbekistan government wants to invest 84.8 billion som for the urban street lights transformation.
According to the Uzbek Ministry of Finance news, in order to reduce energy consumption, introduce advanced energy-saving technologies, optimize the lighting system, the Ukrainian government plans appropriate funds 84.8 billion som (about 28.3 million US dollars according to the official exchange rate) in 2017-2019 for upgrading 28 city including the Tashkent city of the street lighting system including 28 city street lighting system.
The project involves replacing 8,283 luminaire and optimizing 2779.2 km of lines, plans to replace the existing high-energy-consuming luminaires with modern energy-efficient lighting that used the light-emitting diode technology by 2020 .
Taiwan Jia City plan to install LED street lights.
Goverment of Chiayi City, Taiwan said that, the city replaced a total of 30000 mercury lights, and installed on the new LED street lights, it is expected to complete 13000 lights in the first stage before the Lunar New Year, the 17,000 lights of the second stage is expected to contract with the contractor in the near future, construction after the Spring Festival.
Director of Works, Mr Lee Kin-yin, said that the project costs of the first stage paid from the central grant of $ 130 million. The second project cost is $ 170 million, purchasing 17,000 LED street lights and can save about 25 million yuan using LED street lights each year.
Road lighting is an important part of urban lighting, the traditional street lights often use 360-degree lighting, the shortcomings of light loss caused by a huge waste of energy. At present, the global environment is worsening, countries are developing clean energy. With the rapid growth of the national economy, the contradiction between energy supply and energy demand is becoming more and more serious, and the power supply is in serious shortage. Energy saving is an urgent problem to be solved. Therefore, the development of new high efficiency, energy saving, long life, high color rendering index, environmental protection LED street lights is of great significance on the city lighting energy saving.
Road lighting is closely related to people's production and life. Along with the acceleration of urbanization in China, LED street lights into the people's vision with the advantages of directional lighting, low power consumption, good driving characteristics, fast response, high seismic capacity, long service life and green environmental protection, and become a new generation of energy-saving light source, therefore, LED street lights will become the best choice for road lighting energy-saving transformation.
Hangzhou ZGSM Technology Co., Ltd is located in Linglong Industrial Park, the west of Hangzhou. ZGSM is a hi-tech and private Enterprise devoted to R&D, producing and selling of high quality outdoor lighting, industrial lighting, LED traffic lights, solar panels and solar powered LED lighting system and so on.
Over the past few years, we always adhere to the purpose of taking the science and technology as the lead, striving for survival on the basis of quality and service, quickly rises in the fierce market competition. Products are sold throughout the country.
Main products：LED street lights, LED high bay lights, LED flood lights, LED canopy lights, LED stadium lights, LED gas station lights, LED solar street lights, LED tunnel lights and so on.
