Dive Light — What It Is and Why It Matters

A dive light is a waterproof flashlight or torch designed for underwater use. Primary dive lights provide wide, powerful beams for illuminating the dive environment during night dives, wreck penetrations, and cavern dives. Backup lights are smaller, simpler lights carried as redundancy. Signal lights and markers are used for buddy communication and surface visibility.

Modern dive lights use LED technology for brightness, efficiency, and long burn times. Key specifications include lumens (brightness), beam angle (spot vs. flood), burn time, depth rating, and battery type (rechargeable lithium-ion for primaries, disposable cells for backups). Canister lights with a separate battery pack connected by a cord are used for extended cave and wreck penetration diving.