LED street Lights advantages than HPS

Currently the main source of urban road lighting traditional high pressure sodium, fluorescent, etc., which, with its high-pressure sodium lamp luminous efficiency, strong fog penetration ability and other characteristics, the largest use in road lighting. Combined with China's current road lighting design features, the use of high-pressure sodium street lighting has the following the following disadvantages:

(1) A lamp shines directly on the ground, and high illuminance, in some secondary roads can reach 401x or more, but obviously, this illumination belongs excessive lighting, resulting in a lot of energy wasted. Meanwhile, in two adjacent lamps cross position, only be achieved by direct irradiation direction of illumination of about 40%, can’t effectively meet the lighting needs.

(2) High pressure sodium lamp reflector efficiency is only about 50-60%, which also indicates that in lighting by approximately 30-40% of the light inside the lamp are irradiated in the overall efficiency of only 60%, there are serious waste.

(3) Theoretically, high pressure sodium lamp life of up to 15,000 hours, but by voltage fluctuations and the impact of the operating environment, its life far unable to reach the theoretical life, the annual failure rate of lamps are more than 60%.

Compared with traditional high pressure sodium lamp, LED lamp has the following advantages:

(1)As a semiconductor element, the effective life theory, LED lamps can reach 50,000 hours, high pressure sodium lamp 15,000 hours much higher.

(2) Compared with the high-pressure sodium lamp, LED lamp color rendering index can reach 80 or more, quite close to natural light, in this light, the human eye can effectively play recognition feature to ensure road traffic safety.

(3) When the lights turned on, high-pressure sodium lamps require a warm-up process, the light from dark to bright take some time, not only cause the waste of energy, but also affect the effective implementation of intelligent control. By contrast, LED lights turn on at the moment will be able to achieve the best light, there is no so-called start-up time, it is possible to achieve a good, intelligent energy-saving control.

(4) From the light-emitting mechanism, the HPS uses a mercury vapor light, abandoned after the light source, if not effectively addressed, will definitely lead to the corresponding environmental pollution. Such as the use of solid-state LED lighting, there is no harmful substances, it is a green light.

(5) from the optical systems analysis, high pressure sodium light sources belong wholly to the light, there are more than 50% of the light reflected by the reflector needs to after exposure to the ground, in the reflection process, inevitably some loss of light, affecting their utilization . LED lights belong to the one-way light, the light can be directed directly irradiated, so utilization is relatively high.