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LED lamps are great for the environment, but bad for our health

Flicker can be bad for your health. Even if it is so fast that you can’t see it and are unaware of it, it can cause headaches and eyestrain and interfere with the control of eye movements. Most lamps flicker between bright and dim but the flicker from LEDs changes almost instantly between bright and black.This means that sometimes people can see a trail of the same image of a lamp repeated one after the other, every time their eyes move across it. This pattern is particularly noticeable with the LED tail lights of cars, but it can sometimes be seen with LED room lights.

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