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Why does LED street light flicker?

Why does LED street light flicker?

2021-04-14

LED street lighting has been basically mature after many years of application technology accumulation. It has already been applied on a large scale in the lighting industry and has entered a period of rapid development. However, many users say that LED street lights are not easy to use because they have stroboscopic problems, but the reason for this may be product quality problems or improper use.


Stroboscopic is to watch the screen of another electrical appliance on the screen of one electrical appliance. A bright line on the screen of another electrical appliance will move from the bottom of the screen to the top, and then appear from the bottom. Turn on the phone camera mode and aim the lens at the LED street light on the side of the road, and you can find that there is a "ripple" phenomenon in the phone camera, which is "stroboscopic". Almost all types of lights are prone to flicker, including incandescent, halogen, and even LED lights. But the effect of each light is different. For example, in incandescent lamps and halogen lamps, the filament temperature reacts slowly to changes in current, so the flicker effect is not noticed. For the current changes, the LED responds almost immediately, so the flickering will be more noticeable. If the LED lamp is driven with an over-temperature protection function, and the heat dissipation performance of the material of the lamp cannot meet the requirements, the over-temperature protection of the drive will flash and go out when it starts to work.


We can analyze the causes of LED street lights stroboscopic according to several methods as below:


First of all, confirm whether the driving voltage and current required for the series and parallel number of the lamp LED are within the nominal range of the output parameters of the LED driving power supply. If it exceeds the nominal range, it may cause the lamp to flicker.


Secondly, confirm the wiring voltage drop range in the entire LED lighting street lamp circuit, that is to say, measure the actual voltage of the lamp bead string farthest from the LED drive power supply, plus the wiring voltage drop should be within the highest output voltage range of the LED drive power supply Inside, if the maximum output voltage of the LED driving power supply is exceeded, it will cause the light to flicker.


Once again, confirm that the working environment of the outdoor LED street light power supply is in line with the requirements of its manual, such as the range of input AC voltage, too high or too low input voltage will trigger the undervoltage and overvoltage protection of the LED driving power supply; the working environment temperature has been The heat dissipation environment, the working environment temperature is too high or the heat dissipation environment is not ideal, such as airtightness, poor air circulation and other heat dissipation environments may trigger the overheat protection circuit of the LED driving power supply and cause the lights to flicker.


Finally, confirm whether the control system or dimming system matches the LED street lamp power supply. Different control systems or dimming systems have different requirements for the LED drive power supply. The main thing is to pay attention to the agreement of the control port and the voltage amplitude of the dimming port. Value, frequency, compliance of the interface.


In theory, all light sources that use alternating current have stroboscopic flashes, and LED lights are naturally no exception. As the main outdoor lighting fixtures, street lights can easily make it difficult for the surrounding residents to fall asleep, leading to insomnia and other symptoms. Some people think that "outdoor lamps do not require too much strobe flashing, it's almost the same." In fact, drivers or residents have been exposed to poor lighting conditions for a long time, which is harmful to the eyes and body. However, we can change the ordinary alternating current stroboscopic frequency into a higher stroboscopic frequency through a special device. Although the stroboscopic frequency still exists, it can achieve the effect of nearly no stroboscopic, reduce the impact on the human eyes, and protect the eyes The role of the body. This requires the customer to reach an agreement with the manufacturer in advance to find a suitable solution.


outdoor LED street light

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