Festoon LED bulbs replace the common festoon bulbs that are used in many lighting applications including automotive and marine. The 6 LEDs in this 37mm festoon are arranged on one side. Light output is similar to a 10 - 20 watt halogen. These high quality SMD LED replacement bulbs save power. Energy efficient, they last up to 50 times longer than a standard bulb. The latest SMD chip technology is used that provides the highest light output to consumption ratio available today.