Abstract: A user-defined festoon lamp component, including a festoon lamp and a remote controller adapted to the festoon lamp. The festoon lamp includes a first MCU and a wireless receiving unit electrically connected to the first MCU, a first power supply unit, a white light LED unit and an RGB LED unit. The remote controller includes a second MCU and a wireless transmitting unit electrically connected to the second MCU, a second power supply unit and a button matrix unit for controlling the luminescent state of the white light LED unit and RGB LED unit. The festoon lamp is electrically connected to the wireless transmitting unit of remote controller through the wireless receiving unit. The button matrix unit includes an R button, a G button and a B button for independently increasing the R color, G color and B color in RGB LED unit.