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High CRI: color rendering index of LED street lamp light is much higher than that of high pressure sodium lamp. CRI of LED street light can reach 80, high pressure sodium lamp is only about 25, from the point of view of visual psychology, to achieve the same brightness, illumination of HPS should be 3 times higher than LED street lights, that means illumination of 1W LED is equal to 3W HPS. But in fact, the road looks brighter, more comfortable, the driver also feel more secure in the lighting of LED street lights. maintenance cost.http://www.thsled.com