Dive Light

An underwater flashlight used for night dives, overhead environments, and restoring the color that water filters out even in daylight.

A dive light is more than a night diving tool. Water swallows color quickly, with red gone within about 5 m and orange and yellow fading not far below, so even at midday a light held close to the reef reveals the reds and purples your eyes stopped seeing on descent. On night dives, in wrecks, under ledges, and in caves, a light is simply the difference between seeing and not.

Divers grade their lights by role: a primary light with a tight beam for signaling and penetrating particles in the water, and one or two small backups stowed in pockets for when the primary fails. In overhead environments carrying a primary plus two backups is the standard minimum. Beam angle matters too, with narrow beams for communication and wide beams for video and close viewing.

Light signals are a language: a slow circle for OK, side to side for attention, rapid movement for a problem, and you avoid ever shining a beam into another diver's eyes. Burn time should comfortably exceed the planned dive, a detail worth checking during setup.