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why does my led light bulb keep flickering

With fluorescent lighting gradually being displaced in favor of LED, many thought the days of dealing with flickering lights were over. Despite flickering being less present in LED than with fluorescent systems, it is certainly still a factor. What are the causes of this, and are there solutions? There are two types of flickering with lights P visible flicker andP invisible flicker. Obviously visible flicker is the one our eyes can see, which is when the light output from a given source changes rapidly. It is considered that anything below a frequency of 100Hz can be seen. There are health concerns with visible flickering. Short-term exposure to frequencies in the 3Hz to 70Hz range are associated with epileptic seizures, with the highest possibility of occurrence being in the 15Hz to 20Hz range. With 1 in 4000 people suffering photosensitive epilepsy and many more who have not been diagnosed, this has become a public safety issue. Invisible flicker is just as much of a problem if not more. It is the flicker that is present but we cannot see. The symptoms include dizziness, eyestrain, headaches, migraines, impaired thought, and other general sick-feeling symptoms. Where does flicker come from? To better understand flickering in lights, consider the theatrical effect known as strobe lighting. This is a deliberate flicker effect that delivers light at certain frequencies, causing the brain to interpret moving objects as if they were in slow motion.

These specified frequencies are generally just a few flashes per second, but they are very close to frequencies that cause epileptic seizures. Unintentional flickering in lighting equipment can be traced back to our power companies that designed electricity flow to use alternating current (AC) as opposed to direct current (DC). With AC power, the sine wave will peak both positively and negatively. This leaves it susceptible to being in a range that will cause flickering, or sometimes an audible hum. How to solve LED flickering issues? LED flickering can be tied back to the driver component within the lamp. The essential purpose of the LED driver design is to rely on a simple circuit to control output current, but without altering the frequency, the LED becomes likely to show visible flicker. However, this can be fixed by using constant current drivers, which remove the peaks of the sine wave. Power correction components within the driver circuit must also be addressed. Without this, ripple currents in the power flow will cause flickering. Ultimately if the driver design of the LED bulb meets the requirements of both a stable DC current and ample ripple suppression, there should be no flicker.

If flickering is present in your LED lamp (and you are not dimming with it), it was likely created with cheap driver components. The technology in LED lighting has advanced toPthe point where this should not happen, unfortunately there are companies that care more about their bottom line than the health of their customers. Another challenging variable for LED lamps to avoid flickering is through dimming. Most standard wall dimmers work by phase cutting, which removes part of the sine wave and reduces the voltage. However, this can have negative affects on an LED circuit and actually result in the flicker effect being amplified to a potentially dangerous level (3-15Hz range). This is one of the main reasons why it s hard to trust old dimming systems with new LED bulbs. The only way to be sure no flickering will be present is to get LED-specific dimming solutions for your LED lamps. It all comes back to the fact that LED is a long-term investment. PIn turnPit is worth doing research to ensure you are getting a quality LED bulb, and that if you plan to dim with it you are getting an LED dimming system that has been tested as being compatible to the LED bulbs you intend to use. Tags:,
Investing into LED lights is a great way to save money, but sometimes those lights can cause a few problems.

They are expensive to replace every time they flicker and those lights can flicker a lot! The good news is that this issue can often be fixed. Don t run out to buy a bunch of bulbs because there s a good chance they ll all flicker. Take a look at these issues instead to eliminate the flicker once and for all. The most common reason why LED lights will flicker, especially if it is only an occasional problem, is because there are voltage changes happening within the wiring of the home. This is because there is a current flow in the wiring and the resistance of each wire uses some of the voltage. If you turn on a washing machine while the refrigerator is running and this is when you see a flickering LED light, then there s a good chance you have loads turning on and off that change the voltage levels and this is causing the flicker. Many appliances will require more power when they first start than when they are running consistently. This is called surge wattage and the power drain required can cause LED lights to flicker. This is because there is a large drop in voltage in the home. Both problems can be corrected by moving the heavier load items to their own 240 volt circuits. This isn t always a cheap option, but is often a necessary one because otherwise a voltage load could cause future problems that an insurance policy might not always cover.

Even with proper loads, however, LED lights will continue to flicker, but often imperceptibly. Another common reason why LED lights flicker is because there is a loose connection within the circuit. Try screwing the light bulb in further to correct the problem. If this does not work, then dust or debris might be interfering with the connection to make it loose. Take a bottle of compressed air and just blow out the connection point to remove dirt. There could also be wiring at the connection point that has worked its way loose over time, which would mean needing to disconnect the power to the circuit and then tighten up the wiring. A lot of homes today have dimmer switches and many of these are actually incompatible with the modern LED light bulb. If you do have a dimmer switch, try replacing one or two of your LED bulbs on the circuit with traditional incandescent bulbs or the energy saving ones. This can correct the load issues and stop the flicker. Some issues can be self-corrected, like tightening a light bulb. If you need wiring changes, however, then you may need a professional. You might also need building permits to initiate the repair. Once completed, however, you should be able to stop those LED lights from flickering once and for all.

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