The light flicker caused by unstable input voltage is a low-frequency, irregular brightness variation resulting from external power supply fluctuations, while flicker-free output is a stable output achieved by the power supply and driver circuit actively suppressing ripple. The two are fundamentally different in terms of cause, manifestation, and harm.
Differences
|
Di me nsi on |
Light Flicker from Unstable Input Voltage |
Flicker-Free Output |
|
Cau se |
The supply voltage exceeds the rated range (e.g., ±10%), triggering dynamic compensation by the voltage regulator circuit or abnormal PWM duty cycle adjustment. This is an external disturbance |
Achieved through technologies such as DC constant-current driving, large-capacity filtering, and analog dimming, which actively eliminate current fluctuations. This is a circuit design characteristic |
|
Ma nife stat ion |
Brightness exhibits low-frequency (2-5Hz), irregular changes that are easily noticeable to the naked eye, sometimes accompanied by intermittent extinguishing |
Brightness is consistently stable with no periodic changes. The fluctuation depth is typically ≤0.4% (standard for reading/writing lamps) |
|
Har m |
Easily causes eye fatigue, headaches, and difficulty concentrating, and may even trigger frequent over-voltage protection in the driver IC |
Reduces visual fatigue, suitable for long periods of reading and working, and extends LED lifespan [citation:2] |
Key Identification Points
Light Flicker (from voltage instability): Often occurs during end-of-charge periods or sudden grid load changes. The brightness changes at a low and unstable frequency. When filmed with a phone camera, obvious water ripples or alternating bright/dark stripes appear .
Flicker-Free: Regardless of how the input voltage fluctuates within the normal range, the output current remains stable with no visible flicker. Professional testing shows the fluctuation depth is far below industry standard thresholds In summary, light flicker caused by unstable input voltage is a fault or design flaw, whereas flicker-free output is a design goal of high-quality driver circuits. They are fundamentally different in nature
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