This article will introduce the benefits of using neutral white LEDs to replace cool white LEDs in street lighting applications, including street visibility of liquids, skin and flower tone performance, etc. In addition, this article will also explore solutions for temperature and optical design, such as forced ventilation, glare, and brightness. Because LED technology has the advantages of small size and diversification, it is easy to realize brand new street lamp design.
Based on tight budget considerations, LED-based lighting can save electricity costs through less maintenance intervals and power-saving innovative dimming technology.
In recent years, after technological evolution, LED has significantly improved the photometric output, luminous efficiency and service life. Therefore, it has become more and more attractive for various applications that used other light sources in the past, especially street lamps are currently available. Applications that are resolved using LED technology.
LED-based street lights first appeared on the street a few years ago, although they were mainly used to showcase design concepts or campus test lights. At the time, yellow phosphor was one of the only phosphors available and stable to match the blue chip to produce white light output. Most of these street lamps are designed with cool white LEDs, and the color temperature is about 6000K or even higher. Unfortunately, most people do not like the cool white light emitted by these street lights, and some even complain that the cool white light will bring a cold feeling. In addition, some people feel that the color looks pale under the illumination of a cool white light source.
LED and phosphor manufacturers have heard feedback on the first-generation prototype setup, and have begun to develop new neutral white high-brightness output LEDs that use a more natural, 4000K color temperature for street lighting applications. For example, Avago ’s ASMT-JN32-NVV01 can provide a 100lm or 700mA current at 350mA to provide a minimum typical 4000K correlated color temperature (CCT) photometric output at 160lm.
The recommended standard for LM-80 LED life test requires that the LED light source must have a minimum life of 35,000 hours. Newer high-power LEDs can reach a minimum of 60,000 hours at high junction temperatures (L70, B10). Based on an average of 12 hours of use per day (approximately 4400 hours per year), street lights using the latest LED technology can easily reach a 10-year lifespan without replacing the light source.
From the perspective of product packaging, modern LED packaging has a low thermal resistance of 6 ~ 9 ℃ / W (K / W). This helps to transfer heat from the junction to the heat sink as much as possible. In addition, the photometric output at different junction temperatures is also very stable, with a variation of less than 20% in the range of 25 ° C / to 110 ° C / junction temperature.
Another advantage of using neutral white high-power LED is that it uses advanced phosphor technology, which can bring better spectral distribution. Compared with cold white LEDs, the light emitted by neutral white LEDs has more yellow and red wavelengths. Such a spectral distribution helps to distinguish different liquids on the asphalt road surface. Cool white LEDs basically make it difficult to distinguish oil, water or cherry juice on the street-if you are driving, it can be helpful to recognize the oil stains on the ground! On the other hand, a neutral white light source can make brown oil stains or red cherry juice very easy to distinguish.
In addition, the skin tone under a neutral white LED light source is relatively natural. The colored flowerbeds and green turf in the houses along the streets will also look more flattering and warmer. Community security and personal safety will also be enhanced by brighter street lights. Global statistics indicate that under better street lighting, theft and car theft cases will be greatly reduced.
The use of LEDs is very simple and widely used, which can bring many new and charming street lamp designs, such as ultra-thin designs and long or square lamp housings. Designers and engineers must consider all design aspects (including temperature, optics, and electrical, etc.) to complete successful commercial street lamp projects.
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