SmoCo Sailingvideo
Project Mini-sode 4 | Installing Underwater Lights
December 13, 2025 · 19 min · 451 views
What this video covers
The crew of SV Cosmo installs Lumitech Javelin underwater lights on the stern and Lumitech Quattro lights on the bow to improve nighttime visibility and safety.▶ 0:31 The installation requires drilling holes through the hull below the waterline, necessitating careful measurement from the inside to avoid fuel tanks, rudder components, and bulkheads.▶ 1:05 After drilling, the team scuffs the light housings with 80-grit sandpaper and applies 3M 5200 sealant to ensure a watertight bond.▶ 6:14 To prevent potential leaks, they reinforce the installation areas with fiberglass and epoxy from both the inside and outside of the hull.▶ 15:17 Wiring is routed through existing chases and connected to a spare DC panel, allowing for independent control of the bow and stern lights.▶ 17:40 The lights provide illumination beneath the surface, which helps the crew identify underwater obstructions when entering anchorages at night without the glare associated with deck-mounted spotlights.▶ 18:56
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