Diode Dynamics DD0055Q HP48 Amber BulbsLED Indicators. The factory incandescent turn signals on the Ford Flex illuminate in a slow glow, taking a moment to turn off and on. With replacement LED bulbs, you can immediately update your vehicle with the instant on off blinking of modern LEDs. This instant activation adds a modern and distinct look to the Flex. Dual Brightness. The Flex uses a 3157 dual filament bulb. They light up with low power as parking lights, then they get brighter when