Too long line: the line between the controller and the lamp is too long, and the line impedance will increase, which will affect the signal transmission and dim the lamp. The solution is to shorten the line length or use thicker wires.

Power supply problem: If the output voltage or current of the power supply is unstable, it will also cause the lights to dim. It is recommended to check whether the power supply meets the rated voltage and current requirements of the lamp.

Wrong wiring: If the wiring is wrong, the current may flow into the relay or other parts in the opposite direction, resulting in dimming of the lights. It is necessary to check whether the wiring is correct and eliminate the wiring fault.

Lamp failure: If the light-emitting elements such as light bulbs or light-emitting diodes are damaged or aged, it will also lead to dimming of the lights. Damaged lamps can be replaced and eliminated.

Controller failure: if the above problems are eliminated after inspection, the cause cannot be determined, and the controller itself may be faulty. Technicians need to be contacted to maintain or replace the controller.

In a word, we should pay attention to the above factors when designing, wiring and maintaining the control circuit of colored lights to ensure the stability and brightness of the lights.