All mains-powered light sources flicker – whether halogen, fluorescent incandescent, or LEDs.
In the UK, mains electricity is an alternating current (AC) power supply, delivered at a frequency of 50 hertz. Which means the electric current that powers your lights – any lights – switches backwards and forwards 50 times each second.
We didn’t used to notice it with our old incandescent bulbs, because the bulb’s residual heat kept the filament glowing between flickers. This was a side-effect of the inefficiency of traditional bulbs. These old incandescent typically wasted around 90 percent of input energy through heat!
LED flicker is caused by your electronic power supply, some people believe it can be avoided completely as long as the power input (current and voltage) remains constant. That is a a common misconception.
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