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LED Street Lighting Design Requirements
Sep 08, 2017

LED street lamp is made of street lamp, LED lamps and lanterns with high efficiency, safety, energy saving, environmental protection, long service life, fast response speed, high color rendering index of unique advantages, the city lighting energy saving is of great significance.

Road lighting is an important part of urban lighting. Traditional street lamps are often adopted, and the high pressure sodium lamp has a 360-degree glow. The disadvantages of large loss of light cause great waste of energy. At present, the global environment is deteriorating and countries are developing clean energy. With the rapid growth of the national economy, China's energy supply and demand contradiction is becoming more and more prominent, the power supply is beginning to have a serious shortage, and energy saving is an urgent problem to be solved. Therefore, it is of great importance to develop new high efficiency, energy saving, long life, high color index and green LED street lighting.

Road lighting is closely related to people production and living, with the speeding up of urbanization in our country, LED street lamp with directional light, low power consumption, good drive performance, fast response, high seismic ability, long service life, green environmental protection advantages of gradually into people's horizons, to become the world's most advantages instead of traditional light source of a new generation of energy-saving light source, therefore, LED lights will be the best choice of the road lighting energy saving reconstruction.

Design requirements

1, the biggest characteristic of LED lighting is has the function of directional transmission light because almost all equipped with power type LED reflector, and the efficiency of the reflector are significantly higher than the efficiency of the reflectors of lamps and lanterns. In addition, leds have been used to detect the efficiency of their own reflectors. The way of using LED lamps and lanterns should as far as possible use of LED light beam transmission characteristics, make roads for each LED directly into the light of lamps and lanterns is according to the road of each area, reuse reflector lamps and lanterns of auxiliary light distribution, to achieve the comprehensive light distribution of lamps and lanterns is very reasonable way. It should be said that the road lamps should truly meet the standard requirements of CJJ45-2006 and CIE31 and CIE115 standard and the uniformity of the illumination and illumination. The light should contain the function of three times of light distribution. The LED with a reflector and a reasonable beam output Angle has a good light distribution function. In the lamps and lanterns, the installation position and the direction of the emitting light can be realized in the direction of the installation position and emission light of the various leds according to the height and pavement width of the road lamps. The reflector in this kind of luminaires is only used as the auxiliary three times to ensure a better uniformity of road illumination.

In the design of the actual road lighting lamps and lanterns, can be used in the basic set up at an LED beam direction under the premise of the each LED with spherical universal joint on the lamps and lanterns, when used in lamps and lanterns of different width, height and irradiation can be adjusted by the spherical universal joint make every LED irradiation direction to achieve satisfactory results. In determining each LED output power and beam Angle, according to E (lx) = I (CD)/D (m) 2 (light intensity and illumination distance inverse square law), were calculated for each LED in the basic output light beam Angle when selected should have the power, and by adjusting the output power of each LED and LED driver circuit to the power of each LED different to keep every LED light output reaches expected value. These adjustment means are using LED light source of road lamps and lanterns is peculiar, make full use of these characteristics can be achieved in the road pavement illuminance and intensity of illumination evenness under the premise of reducing lighting power density, achieve the goal of energy saving.

2, the power of the LED street lamp system is different from the traditional light source, LED by realizing the constant current drive power, is to guarantee the normal work of a large foundation, a simple scheme of switch power supply damage often a LED device. How to tighten tightly together a group of LED safety, is also a measure of LED street lamps. LED to the requirement of the drive circuit is can ensure constant current output characteristics, because the LED forward junction voltage relative changes at work area is very small, so to ensure the LED drive current constant is basic guarantee for the LED constant power output. For our country the status quo of the power supply voltage is not stable, road lamps and lanterns of LED driver circuit with constant current output characteristics is very necessary, can ensure constant and prevent the super power of the LED light output.

In order to make the LED drive circuit to present constant current characteristics, the output internal impedance of the driving circuit must be high. At work, also through this output impedance load current, if the drive circuit by step-down dc constant current source circuit, rectifier filter after or general switch power resistance circuit, on its must also consume a lot of active power, so the two types of drive circuit in the basic satisfy the premise of constant current output, high efficiency is impossible. The right design scheme is to use active electronic switch circuit or high frequency current is used to drive the LED, using these two schemes can keep driving circuit in under the premise of good constant current output characteristics, still has the very high conversion efficiency