Why LED Strip Flickers and How to Fix Flickering?
LED strips are designed to light up and flicker. However, it is important to distinguish programmed flickering from unwanted flickering. The latter indicates that your LED strip may be faulty. Below, we examine the causes of flickering and how to fix them.
Main Problems Causing Flickering
We have identified 8 main reasons for unwanted flickering:
- The strip’s control unit is set to flicker mode. In fact, this reason is extremely trivial and even funny. But many people turning on the strip overlook that its default operating mode may be set to flicker rather than steady light. Unfortunately, many control units (especially simple ones) do not allow changing the default operating mode.
Solution: After turning on the LED strip, immediately switch it to the desired mode to avoid frustration.
- Poor contact. This can be bad wiring, weak soldered connections, or unreliable clamps. This problem often occurs in the cheapest strips. As a result, current delivery along the strip is interrupted, causing flickering, especially noticeable when the strip moves without being fixed.
Solution: Check the reliability of all connections and initially choose soldered connections over contact clamps, which are prone to imbalance.
- Electromagnetic interference. A common issue often overlooked. Its likelihood increases with the number of wires and electrical devices near the strip. Current flowing to other devices creates interference, and the more wires and the closer they are to the strip, the stronger the interference. It occurs in the strip itself and its control devices: power supply (driver), controllers, and dimmers. Sources can be any device with sufficient current: TV, computer, fridge, electrical panels, or even a nearby Wi-Fi router.
Solutions:
- Use higher-quality drivers and LED strip components;
- Ensure all devices are properly grounded;
- Separate AC wires from DC wires;
- Physically remove nearby electrical devices and wires affecting the strip;
- Power supply issues. It may not match the strip voltage, causing unstable voltage and flickering diodes.
Solution: Ensure the power supply has the correct or slightly higher voltage (15-20%). Also, it should not be overly powerful to avoid burning the LEDs. Usually, replacing a cheap unit with a higher-quality one resolves the issue.
- Unreliable or incompatible dimmer. If your LED strip is dimmable, poor-quality control electronics (dimmer/RGB controller) can cause flickering.
Solution: Use components compatible by watts and volts. Avoid the cheapest, which may not ensure proper operation even if nominally compatible.
- Voltage drop along the strip. Decorating a home or workspace with long LED strips is understandable. However, long strips may not maintain uniform operation along their entire length, especially very long ones, causing voltage drops.
Solutions:
- Reduce the strip’s maximum length;
- Use a power supply with higher rated power or margin;
- Use multiple power sources feeding the strip at several points (if design allows);
- Use a strip with thicker wires for even power distribution;
- Poor physical quality or damage. Low-quality strips may have manufacturing defects, poor assembly, or damage from excessive bending.
Solution: Replace the strip or check and fix physical damages.
- Environmental impacts. Rain, snow, fog, wear, wind, or excessive sun can damage the LED strip. Moisture can short the strip’s contacts with its control electronics, causing flickering or complete failure.
Solutions:
- Use the strip in favorable weather conditions;
- Isolate electronics from weather (cover, insulation);
- Use strips designed for harsh conditions with proper IP rating;
- Replace non-working strip with a new one and ensure proper protection.
We are confident that these issues can be fully avoided if you purchase a correctly assembled strip and components matching its technical specifications. We also advise against saving on quality initially to enjoy proper LED strip performance.
If you need practical advice on selecting strips, components, or other LED strip guidance, contact us. Our company will help make your strip a source of joy, not worry.