What is LED strobe
LED stroboscopic refers to the visible or invisible flickering phenomenon produced by the LED light source during rapid switching. This phenomenon is usually caused by improper power drive method, dimming technology or circuit design, and may have a potential impact on visual health. The following is a detailed analysis of LED strobe:
1. Causes of LED flicker
LED strobe is mainly related to the following factors:
| Type of cause | Specific instructions |
|---|---|
| Power drive mode | When using pulse width modulation (PWM) dimming, the rapid switching of current on and off causes periodic changes in light output. |
| Circuit design defects | When the filter capacitor is insufficient or the voltage is unstable, the AC component is not fully filtered out. |
| Inferior LED products | Low-cost driver solution or component quality is not up to standard |
2. Hazard level of strobe
According to the IEEE PAR1789 standard, the risk of flicker is divided into three levels:
| risk level | Strobe frequency | Fluctuation depth | health effects |
|---|---|---|---|
| low risk | >3125Hz | <5% | Basically no perception |
| medium risk | 90-3125Hz | 5-30% | May cause visual fatigue |
| high risk | <90Hz | >30% | Induces headaches and risk of epilepsy |
3. Detection and improvement methods
To solve the problem of LED flickering, the following measures can be taken:
| Detection method | Improvement plan |
|---|---|
| Mobile phone camera detection method | Replace with constant current drive (CC) power supply |
| Professional strobe tester | Choose high frequency PWM (>3000Hz) products |
| Persistence of vision | Add filter capacitor or linear dimming circuit |
4. Industry standards and certification
Comparison of major global LED strobe standards requirements:
| Standard name | Strobe requirements | Scope of application |
|---|---|---|
| IEEE1789-2015 | Fluctuation depth<8%@120Hz | North American market |
| IEC TR 61547-1 | SVM<0.4 | EU market |
| GB/T 31831-2015 | Strobe ratio ≤ 6% | Chinese market |
5. Purchase suggestions
To avoid stroboscopic hazards, consumers are advised to:
1. Give priority to products marked with "no flicker" or "low risk flicker"
2. Check whether the product has passed EyeSafe, Flicker-Free, etc. certifications
3. During the actual test, you can observe whether there are stripes on the screen captured by the mobile phone.
4. Educational lighting places should choose professional lamps with a stroboscopic index <5%.
6. Technology development trends
The latest industry trends display (based on hot data in the past 10 days):
| Technical direction | Summary of progress | Representative manufacturer |
|---|---|---|
| Digital hybrid dimming | Combining the advantages of PWM and analog dimming | Texas Instruments |
| GaN driver IC | Switching frequency increased to MHz level | NanoVis Semiconductor |
| AI dynamic compensation | Monitor and adjust output waveforms in real time | Osram |
With technological advancement, the global flicker-free LED market will reach US$7.8 billion in 2023, with an annual growth rate of 12.5%. Increased consumer health awareness will continue to drive the industry towards safer lighting solutions.
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