The Holt R983 festoon bulb. Designed with navigation and interiors in mind, this versatile bulb can used on just about any area of your vessel. This 5W bulb provides clear, bright light to illuminate any area of your choice. The R983 can be used in smaller, confined spaces in the interior of your vessel, or larger outdoor spaces. Holt bulbs have a long lifespan, reliably lighting your vessel without the hassle of replacing the unit on a regular basis.