Shadow-Caster 4-Channel Underwater Light Relay Module

The Shadow-Caster 4-Channel Underwater Light Relay Module is the control hub serious boaters and anglers need to manage multiple subsurface LED lighting zones from a single command point. Whether you're running underwater accent lights, transom spreads, or full-hull illumination systems, this relay module coordinates up to four independent channels with precision switching and power distribution. Installed aboard everything from center consoles and sport-fishers to pontoons and deck boats, it transforms fragmented lighting into a unified, controllable ecosystem—essential for night fishing, docking in low visibility, and creating operational safety around the entire vessel.

Built by Shadow-Caster LED Lighting, a marine-grade specialist in underwater illumination, this 4-channel module handles the switching logic and power relay architecture that keeps multiple light circuits independent yet synchronized. Each channel isolates load distribution, preventing voltage drop across the system and protecting individual LED assemblies from surge or cross-current damage. The compact 6 x 3 x 9-inch form factor fits easily in helm consoles, electrical cabinets, or hidden compartments without consuming valuable deck space, while its 1-pound weight keeps system balance unaffected. Marine-grade construction ensures corrosion resistance in saltwater and spray environments—critical for longevity in harsh offshore conditions.

Anglers who rely on underwater lights for night fishing benefit most from independent channel control; you can adjust transom lights for structure visibility while keeping hull accent lighting at a separate intensity to avoid spooking baitfish. Boaters managing docking lights, courtesy lighting, and entertainment zones all prefer this modular relay approach—one module handles all four zones without cluttering the electrical panel. Installation pairs seamlessly with existing Shadow-Caster underwater LED systems and works alongside standard marine 12V or 24V DC power supplies. Compatibility with helm-mounted control panels and wireless dimmer switches makes retrofit or new-build integration straightforward for dealers and DIY installers alike.