Your LED bulb might be flickering due to loose or incorrect wiring, incompatible dimmer switches, or bulb components such as a defective LED driver. When you overload your power supply by drawing too much wattage from the output, your LED strip lights will begin to flash in a consistent pattern. LED Lights Flicker Without Dimmer. Buzzing or flickering noise on LED lights isn’t an isolated problem but rather a common problem on these types of bulbs. But note that my circuit makes a complete RC filter, with a capacitor (C) and a lamp to serve as the resistor (R). Because of the very low load presented by an LED string, this reduces the flicker. There are three different rooms/circuits where the LED lights flicker. This can not only be very irritating but will probably mean sooner or later you are going to be left in the dark. In many cases, the flickering of a T8 LED can be related to the driver components within the lamp. The lights flicker at different "flicker frequencies" as you can see in the videos. Under powering your lights, such as using a 12-Volt driver for 24-Volt strip lights, is likely to cause your lights to flicker, dim, or not light up at all. The good news is that the flicker is most likely not caused by the LED strips or other components, so your replacement costs will be limited to the PWM dimmer / controller. In fact, fixing them is a relatively straightforward job, here is how to do it. The lighting industry has waded through the often-choppy, often-murky waters of LED dimming over the last several years and, while a lot of the problems have been solved, flickering and strobing and early burnout still happens all the time. To cut to the chase, three points of fault usually make lights flicker. The flicker frequency also varies from time to time. Strip lights can become a nightmare when they start to flicker. If your LED strips are losing brightness across the entire strip, this could be caused by two issues: 1) Input voltage into the LED strip has dropped below the designed voltage To determine which of these two issues is to blame, first determine the input voltage at the point where the LED strip is connected to the power supply (i.e. You didn't mention using any lamp or resistor. The low frequency of less than 50 Hz makes the LED bulb flicker. The important thing then when your lights start flickering, is not to ignore them. Vice versa, overpowering your rope lights will make your lights hot to the touch, ultimately causing the wiring to fry and your lights to fail. Although LED is more energy efficient than traditional lights and we can’t avoid using them, these buzzing and flickering noise can be downright frustrating. Constant-current drivers help avoid any peaks in the current wave, eliminating any flickering. I would say the lights flicker about 30-40% of the time. 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