This article describes the benefits of using neutral white LEDs in place of cool white LEDs in street lighting applications, including the visibility of liquids on the street, the tone of skin and flowers. In addition, this article will also explore solutions for temperature and optical design, such as forced ventilation, glare, and brightness. Thanks to the small size and variety of LED technology , it is easy to implement new streetlight designs. Based on budgetary constraints, LED lighting can save on electricity bills with fewer maintenance cycles and energy-saving innovative dimming technology. In recent years, through the evolution of technology, LEDs have been significantly improved in photometric output, luminous efficiency and service life, so it is increasingly attractive for a variety of applications that have used other light sources in the past, especially street lamps are currently available. Applications that use LED technology to solve them. LED-based streetlights first appeared on the streets a few years ago, although they were mainly used to showcase design concepts or campus test lights. The yellow phosphor was the only available and stable phosphor at the time to match the blue chip to produce a white light output. Most of these street lights are designed with cool white LEDs and a color temperature of about 6000K or higher. Unfortunately, most people don't like the cool white light from these street lights, and some even complain that cold white light will bring a cold feeling. In addition, some people think that the color appears pale under the illumination of the cool white light source. LED and phosphor manufacturers heard feedback on the first-generation prototype setup and began developing new neutral white high-brightness output LEDs for street lighting applications using a more natural, 4000K color temperature. For example, Avago's ASMT-JN32-NVV01 can deliver 100lm or 700mA at 350mA to provide a minimum typical 4000K correlated color temperature (CCT) photometric output of 160lm. The LM-80 LED Life Test Recommendations require LED light sources to have a minimum life of 35,000 hours, and newer high power LEDs can achieve a minimum of 60,000 hours (L70, B10) at high junction temperatures. With an average of 12 hours per day (about 4,400 hours a year), streetlights using the latest LED technology can easily reach a 10-year life without the need to replace the light source. From the perspective of product packaging, modern LED packages have a low thermal resistance of 6~9°C/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 variations of less than 20% over the 25°C/to 110°C/ junction temperature range.
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