3156 halogen bulbs are single filament bulbs that rated at 26.88W. 3156 LED bulbs also have a single function that mimics the halogen bulb's operation. 3156 LEDs are available in white and red color. Now because 3156 halogen bulbs are rated at nearly 27W, and depending on your application, you may have to add resistors to the LEDs if your vehicle displays a "bulb-out" warning on the dash.