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ACR, Buying Guide, How-To, Installation Guide, Lighting, Marine Safety, Searchlight

Marine Searchlight Buying Guide: How to Choose and Install a Boat Searchlight

A marine search light with a woman in a bikini standing behing it,

Why a Marine Searchlight Belongs on Your Boat

A marine searchlight is one of those pieces of equipment you don't think about — until you desperately need it. Whether you're navigating an unmarked channel after dark, searching for a mooring ball in a crowded anchorage, spotting a crab pot float before your prop finds it, or assisting in a man-overboard situation, a powerful, remotely controlled searchlight can make the difference between a close call and a catastrophe.

Unlike a handheld spotlight, a mounted marine searchlight keeps both hands free and can be aimed precisely from the helm without leaving your seat. This guide covers how to choose the right unit and how to install it correctly.

 

Key Specs to Understand

Wattage and Light Output

Searchlight output is measured in watts (power draw) and candela or lumens (actual light output). Higher wattage generally means more light, but modern halogen and LED designs have changed the relationship between watts and output significantly.

  • 55W halogen: The traditional standard for marine searchlights. Proven, widely available replacement bulbs, excellent beam throw. The ACR RCL-50 and RCL-100 use 55W halogen bulbs.
  • LED: Lower power draw, longer bulb life, instant-on with no warm-up. Increasingly common on newer units.

For most recreational boats, a 55W halogen searchlight provides more than adequate range and illumination for coastal and inland use.

Beam Pattern

Marine searchlights produce a focused, long-throw beam — not a flood. The tight beam is what gives you range. Some units offer adjustable focus; most are fixed.

Rotation Range

Most marine searchlights rotate 360° continuously and tilt vertically. Confirm the unit you choose has full 360° rotation — limited-rotation units are less useful for scanning.

Control Options

How you control the searchlight matters as much as the light itself:

  • Joystick controller: A dedicated joystick at the helm for precise, intuitive control. The ACR URC-102 Master Controller works with both the RCL-50 and RCL-100.
  • Point pad: A touch-sensitive pad for directional control. The ACR URP-102 Point Pad offers an alternative control interface.
  • Remote kit: The ACR Universal Remote Control Kit (9283.3) provides a complete remote control solution for RCL-50 and RCL-100 installations.
  • Extension cable: For dual-helm installations or longer runs between the controller and the searchlight motor.

The ACR RCL Searchlight Lineup

Egret Marine carries the complete ACR RCL searchlight ecosystem — one of the most respected names in marine searchlights. Here's how the lineup breaks down:

ACR RCL-50

The RCL-50 is ACR's compact searchlight, designed for smaller boats and installations where space is at a premium. It uses a 55W halogen bulb and is compatible with the full range of ACR controllers and accessories.

ACR RCL-100

The RCL-100 is ACR's full-size searchlight, offering greater range and output for larger vessels and more demanding applications. Also uses a 55W halogen bulb.

ACR Controllers and Accessories

Choosing Between the RCL-50 and RCL-100

Feature RCL-50 RCL-100
Best for Smaller boats, tight installations Larger vessels, maximum range
Bulb 55W halogen 55W halogen
Voltage 12V 12V or 24V
Controller compatibility URC-102, URP-102, Remote Kit URC-102, URP-102, Remote Kit

Step-by-Step Installation

Step 1: Choose the Mounting Location

The searchlight should be mounted as high as practical on the boat — a hardtop, T-top, or bow rail gives the best elevation and widest field of view. Key considerations:

  • The light must have a clear 360° rotation path — check for antennas, radar arches, and other obstructions
  • Mount away from the compass (searchlight motors contain magnets that can cause compass deviation)
  • Consider cable routing — you'll need to run power and control cables from the mount location to the helm
  • Ensure the mounting surface can support the weight and vibration of the searchlight

Step 2: Mount the Searchlight Base

  1. Use the provided mounting template to mark hole locations
  2. Drill mounting holes and a cable entry hole for the wiring
  3. Apply marine sealant (3M 4200 or equivalent) to all holes before installing fasteners
  4. Secure the searchlight base with stainless steel bolts and backing plates — do not rely on screws alone in fiberglass
  5. Feed the power and control cables through the cable entry hole before sealing

Step 3: Run the Wiring

The searchlight requires two wiring runs:

  • Power cable: From the fuse block or battery switch to the searchlight motor. Use marine-grade tinned wire sized for the searchlight's amperage draw (typically 10–15A for a 55W unit at 12V). Fuse within 7 inches of the power source.
  • Control cable: From the searchlight motor to the helm controller. Use the cable specified by ACR for your controller — do not substitute generic wire, as the control signal requires the correct cable type.

Secure all wiring runs with cable ties every 18 inches and protect runs through bulkheads with grommets or conduit.

Step 4: Install the Helm Controller

  1. Choose a helm location within easy reach of the helm seat
  2. Cut the mounting hole per the controller's template
  3. Connect the control cable to the controller's terminals per the wiring diagram in the ACR manual
  4. Secure the controller in the panel

Step 5: Connect Power and Test

  1. Connect the power cable to your fuse block, with an appropriately rated fuse
  2. Power on and test full rotation — confirm the searchlight rotates 360° smoothly in both directions
  3. Test vertical tilt through its full range
  4. Verify the light illuminates and the bulb is properly seated
  5. Check all cable runs for chafe points and secure any loose sections

Maintenance Tips

  • Keep a spare bulb on board: A 55W halogen bulb is inexpensive and small — carry one. See our Lighting collection for ACR replacement bulbs.
  • Rinse after saltwater exposure: Flush the searchlight housing and rotation mechanism with fresh water after saltwater use
  • Inspect the cable entry seal annually: Reapply sealant if you see any cracking or separation
  • Test at the start of each season: Confirm full rotation, tilt, and illumination before you need it in an emergency

Shop Marine Searchlights at Egret Marine

Browse our complete ACR searchlight lineup — including the RCL-50, RCL-100, controllers, remote kits, and replacement bulbs — in our Lighting collection. Everything you need for a complete installation is available in one place.

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Questions about which ACR searchlight is right for your boat? Contact the Egret Marine team — we're glad to help.

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