Last night, the CCTV "3·15" party was held in Beijing. The CCTV No. 1 consumption warning was about LED learning lights.
LED lights for children may have serious stroboscopic flashes! This stroboscopic light is not noticeable to the naked eye, but if used for a long time, it will cause visual fatigue and even headaches! Consumers should distinguish whether the LED lights have a screen flash when purchasing.
At the party, two testers showed up and brought a special screen flash tester. The waveform of the screen was relatively flat, indicating that its screen flash was almost zero and there was no harm to the eyes. Take the red light on site as an example. Look at the waveform, its amplitude is very large, indicating that its screen flash is very serious.
In normal life, if you want to detect whether the light bulb has a screen flash, it is very simple. Pick up the phone and use the lens to aim at it. Pay attention to the flicker on the screen and you can know what kind of LED light bulb does not flash. The experimenter introduced that the screen flash is good or bad, and the secret is on the constant current chip. If the LED light with this chip is used, its price will be relatively high, 2-3 times higher.
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