The Switchback LED Bulb when turned on, they output a clean white light and when the turn signals are engaged, they blink amber as normal. The bulb is a direct replacement and features dual switchback with amber and white LED lights. 450-500LM. Plug N Play. GL1800 Note: This product is recommended to be used with GL88NC LED Flasher (Plug N Play) if it is needed so that your signals will normalize and won't blink rapidly.