So let’s start this discussion by debunking a common misconception. Because LED flicker is caused by your electricity supply, some people believe it can be avoided completely as long as the power input (current and voltage) remains constant.
This isn’t true. All mains-powered light sources flicker, all the time.
You are viewing: Why Do My Led Bulbs Flicker
But if all lights flicker, why do some people think flickering LEDs are a problem?
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LED flicker used to be a common problem. This was because – unlike incandescents, halogens and fluorescents – LEDs have no persistence. When the power supply to an LED is switched off, the light output stops instantly. So if connected directly to an AC mains-electricity supply, an LED will switch on/off 50 times each second – enough to be visible to the human eye.
That’s why some people think LEDs flicker more than older light sources. In the past, that used to be true. But it’s not true today.
LED flicker isn’t a problem for modern LED installation projects. This is because we don’t connect the LEDs directly to the mains supply anymore. Instead, we power our LEDs using an LED driver especially designed for the purpose.
Keeping an eye on your LEDs – how a high-quality LED power supply can solve LED flicker
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LED lighting requires a direct current (DC) rather than an AC power supply. Which is good news, because the key to eliminating LED flicker is the kind of power-supply you use to drive your lights.
Although the lighting industry generally knows its power supplies (aka ‘drivers’) simply as ‘LED transformers’, they’re actually more than that. An LED driver doesn’t just step down (transform) voltage. It also converts current from mains AC to DC. Choose a high-quality LED power supply, and it will also supply a constant current to your LEDs. So you’ll get light with no visible flicker.
A lower-quality, no-frills LED driver doesn’t provide a constant current though. Instead, it simply converts current from AC to DC. This most basic kind of power-supply conversion produces an oscillating current, albeit one that typically doubles the input-voltage frequency. In the UK, that will result in a frequency of 100 potential flickers a second.
Source: https://t-tees.com
Category: WHY
