Overview

The Perko 0846 is a 120V, 1000W quartz-halogen medium prefocus replacement bulb for Perko Solar-Ray searchlights. It is built for high-output searchlight use where the vessel already has a compatible 120V Solar-Ray fixture and needs the correct bulb type, socket, and beam performance rather than a general-purpose lamp.

This bulb uses a Medium Prefocus socket with socket code E and has a BTR bulb code. Its rated average laboratory life is 200 hours, with a maximum candlepower output of 4,601,000 and an approximate range of 1-7/8 miles under controlled photometric conditions.

The beam pattern is narrow, with a 4.5 degree horizontal spread and 5.4 degree vertical spread, which suits long-distance searchlight work from larger boats, pilothouses, commercial vessels, and night operations where a focused beam matters more than broad deck lighting.

Key features

• 120V, 1000W quartz-halogen bulb for compatible Perko Solar-Ray searchlights.
• Medium Prefocus socket with socket code E for correct fixture matching.
• BTR bulb code for confirming the replacement against the existing lamp.
• Maximum candlepower output of 4,601,000 for long-range searchlight use.
• Approximate range of 1-7/8 miles when measured under controlled beam conditions.
• 4.5 degree horizontal beam spread and 5.4 degree vertical beam spread for a focused searchlight pattern.
• Rated average laboratory life of 200 hours at the bulb design voltage.

Compatibility and fit

This replacement bulb is for Perko Solar-Ray searchlights that use a 120V, 1000W quartz-halogen Medium Prefocus bulb. It is not a 12V or 24V lamp, and it should not be used as a substitute in low-voltage searchlights, navigation lights, cabin lights, or LED fixtures.

Before installation, match the existing bulb to the 120V rating, 1000W wattage, Medium Prefocus socket, socket code E, and BTR bulb code. These details are important because high-output searchlights depend on the correct lamp position and electrical rating to keep the beam properly focused.

Installation and service notes

Power should be off and the searchlight should be cool before replacing the bulb. Quartz-halogen bulbs should be handled carefully, and keeping fingerprints or oil off the glass helps reduce hot spots during operation.

Actual service life can be affected by shock, vibration, voltage variation, and the operating environment on board. For boats that run at night, make offshore passages, or use the searchlight for docking approaches and target spotting, keeping a spare compatible bulb on board is a practical service habit.

Use on board

This bulb is a match for vessels that rely on a Solar-Ray searchlight for long-range visibility rather than close-area illumination. It fits use cases such as locating markers, checking shorelines, scanning ahead during low-light operation, and supporting deck or bridge crews that need a controlled beam from a fixed searchlight fixture.