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Lighting LEDs have the function of directional emitting […]
Lighting LEDs have the function of directional emitting light, because almost all power LEDs are equipped with reflectors, and the efficiency of such reflectors is much higher than that of lamps. In addition, the LED has taken into account its own reflection efficiency when detecting light efficiency. Road lights using LEDs should make full use of the characteristics of LED directional emission light, so that a single LED in the road light directly emits light to each area of the illuminated road, and then uses the auxiliary light distribution of the lamp reflector to realize the reasonable distribution of road lamps. Light.
The LED with a reflective surface has a reasonable beam output angle, and it has a good primary light distribution function. Inside the lamp body, the installation position of each LED and the direction of the emitted light can be designed according to the height of the street lamp and the width of the road surface to achieve a good secondary light distribution function. The reflecting surface in this kind of lamps is only used as an auxiliary means for the three-time light distribution to ensure that the road illumination is more uniform.
The power system of LED street lights is also different from traditional light sources. The constant current drive power required by LEDs is the cornerstone to ensure the normal operation of LEDs. Simple switching power supply solutions often cause damage to LED devices.
How to make a group of LEDs close together is also an indicator for investigating LED street lights. Since the relative variation range of the junction voltage is small when the LED is working in the forward direction, ensuring the constant LED drive current basically guarantees the constant output power of the LED, so the requirement for the LED drive current is relatively high. In the current situation of unstable domestic power supply voltage, the street lamp LED drive circuit must have constant current output characteristics to ensure the constant light output of the LED and prevent the LED from overpowering.
LED street lights are different from traditional street lights. The LED light source adopts low-voltage DC power supply and combines GaN-based power blue LEDs with yellow synthetic white LEDs. It is highly efficient, safe, energy-saving, environmentally friendly, long life, fast response, and high color rendering index. Advantages, can be widely used on the road. The outer cover can be made, with high temperature resistance up to 135 degrees and low temperature resistance up to -45 degrees.