8/5/2023 0 Comments Make led look flickeryGenerally you’ll find that zero-to-10V dimmers will be less prone to flicker than, for example, a mains TRIAC control. You may discover that you can dim all the way without any visible flicker! the dimmers in our current range all allow you much greater flexibility. Just a few years ago, that often meant not dimming below around 50% of full brightness. ![]() By simply not dimming your LEDs so low, you’ll prevent their flicker cycle becoming visible to the eye. Rather than installing these less flexible (and more expensive) dimmers, you can very easily avoid the visible flicker created by pulse width modulation. There’s a downside, though: the higher the flicker frequency, the nearer to your transformer your LEDs will need to be. ![]() This would simulate the solution used by the electronic ballasts that have powered fluorescent lighting for many years. A cycle of thousands of hertz is the goal. Some manufacturers are working to solve this problem by developing LED dimmers with a much faster flicker cycle. PWM works very effectively – just as long as the switching frequency doesn’t drop to a level that the human eye can perceive. This technique is called pulse width modulation (PWM). That’s because conventional dimmers work by lengthening the ‘off’ part of each on-off flicker cycle, in order to reduce the total amount of light that’s being output. In the UK, that will result in a frequency of 100 potential flickers a second.ĭimming can cause problems even in an otherwise perfect LED lighting installation. ![]() This most basic kind of power-supply conversion produces an oscillating current, albeit one that typically doubles the input-voltage frequency. Instead, it simply converts current from AC to DC. So you’ll get light with no visible flicker.Ī lower-quality, no-frills LED driver doesn’t provide a constant current though. Choose a high-quality LED power supply, and it will also supply a constant current to your LEDs. It also converts current from mains AC to DC. An LED driver doesn’t just step down (transform) voltage. Which is good news, because the key to eliminating LED flicker is the kind of power-supply you use to drive your lights.Īlthough the lighting industry generally knows its power supplies (aka ‘drivers’) simply as ‘LED transformers’, they’re actually more than that. LED lighting requires a direct current (DC) rather than an AC power supply. Keeping an eye on your LEDs – how a high-quality LED power supply can solve LED flicker Instead, we power our LEDs using an LED driver especially designed for the purpose. ![]() This is because we don’tconnect the LEDs directly to the mains supply anymore. LED flicker isn’t a problem for modern LED installation projects. That’s why some people think LEDs flicker more than older light sources. 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. When the power supply to an LED is switched off, the light output stops instantly. This was because – unlike incandescents, halogens and fluorescents – LEDs have no persistence. But if all lights flicker, why do some people think flickering LEDs are a problem? All mains-powered light sources flicker, all the time. 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. So let’s start this discussion by debunking a common misconception.
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