Overview

The Hella Marine 002091361 is a 12V, 10W clear festoon replacement bulb with an SV8.5-8 base for fixtures that use this style of end-cap bulb.

It is commonly used in navigation lights and interior lamps that take an SV8.5-8 festoon, keeping the original light color and beam pattern that the fixture was built around.

For best results, confirm your onboard supply is 12V DC and that the light is rated for a 10W bulb (about 0.8A draw at 12V).

Key features

• 12V, 10W festoon bulb with SV8.5-8 end caps
• Clear glass for the same light color your lens and filter expect
• Drop-in fit for fixtures that use an SV8.5-8 festoon holder, including many navigation and interior lights
• About 0.8A current draw at 12V, useful when checking fuse and circuit loading
• Simple replacement that does not change wiring, switches, or housings

Compatibility and fit

Match the base style first: SV8.5-8 festoons use spring contacts on each end, not wedge or bayonet sockets. If your old bulb has the base code printed on the metal cap or the fixture calls for SV8.5-8, this is the correct fit.

Because festoon lengths vary, compare the old bulb end-to-end before ordering if your fixture has tight tolerances.

Installation and setup

Turn off power at the switch and, if possible, the breaker. Let the lens and bulb cool before handling. Remove the lens, then compress one end of the bulb into the spring contact and seat the opposite end.

Clean any green corrosion from the contacts so the bulb seats firmly; poor contact is a common cause of flicker on boats.

Use cases on board

This bulb suits 12V boats that still run traditional festoon lamps in navigation lights, cabin domes, chart lights, and courtesy fixtures where the housing is built around an SV8.5-8 bulb and a 10W load.

It is a good match when you want a like-for-like replacement without changing fixtures or dealing with LED polarity and dimmer compatibility.

Maintenance and care

Keep the lens gasket and venting in good shape so moisture does not sit in the fixture. If you routinely wash down with saltwater, a quick rinse of the lens area and an occasional contact check will help prevent future failures.