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How to solve the problem of LED lighting strobe

Writer: admin Time:2021-08-06 21:28 Browse:

How to solve the problem of LED lighting strobe

How to solve the problem of LED lighting strobe
LED lights, as a new type of lighting equipment, have been widely used, and the trend to replace other light sources is becoming more and more obvious. But it is undeniable that, as far as the current technology is concerned, the strobe of LED lamps is unavoidable, so how should we deal with the strobe of lamps?
 
What is the strobe of a luminaire?
 
Strobe, there is a frequency of flicker, the light changes rapidly and repeatedly over time is called a strobe, the direct feeling is that the picture jumps, unstable.
A more intuitive feeling is that when we open the photo function of our mobile phone and point it at the light source, we will see the light of the luminaire flickering.
 
How much does the strobe of an LED luminaire/light source affect our bodies?
 
Most people can clearly perceive strobe below 50 or 60 Hz; when the frequency reaches a certain point, the human eye perceives the flickering light as a continuous light source; this frequency is known as the "critical flicker frequency" (CCF).
The CCF varies from person to person and situation to situation, but most people have a CCF of no more than 100 Hz. Many people are uncomfortable with strobe below 50/60 Hz, and some still feel uncomfortable between 50 and 100 Hz, so what frequency is needed to eliminate this effect? This varies from person to person, some say 160 Hz, 200 Hz, some say 500 Hz, but the industry basically believes that up to kilohertz (kHz) is perfectly fine.
 
What are the dangers of strobe LED lights/light sources?
 
Studies have shown that different levels of strobe can have an impact on human physiology and psychology, but of course, the negative ones are the majority, such as damage to eyesight, emotional irritability, inducing epilepsy, etc. For example

  • For stadiums that require lighting at night, such as billiard halls, table tennis halls, badminton halls, tennis halls, etc., it is impossible to see the sporting spheres clearly due to the flickering lights.
  • For photography and video occasions, if lighting with flickering lights is used, it will be impossible to avoid dark areas during photography and black scrolling bars during the video.
  • Including strain, eye fatigue, blurred vision, migraines and loss of vision.
  • Low fluctuation of high-frequency flicker effect is less obvious, perhaps a few minutes to migraine or severe headache, often accompanied by nausea, visual impairment and other symptoms. 
Causes of strobe in LED luminaires/light sources.
 
The vast majority of light sources have strobe but to different degrees. LED strobe, to a large extent, is not the LED chip itself, but from the driver and dimming components, the common causes of strobe are.
  • poor quality driver components can not reduce the "voltage and current output ripple" generated in the process of "from AC to DC" from the driver components to the LED chip.
  • poor quality of dimming components, or poor compatibility, or the choice of low-frequency PWM dimming. 
Summary.
 
As long as you ensure that the strobe frequency of the luminaire is high enough, you can circumvent the bad effects of a light strobe. To achieve what we understand as a strobe-free effect. Bledlighting in order to cope with the lamp strobe situation, in the choice of driver, are high-quality brands, to ensure that the lamps in the light process achieve the effect of no strobe, even if the use of dimming function.


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