Choosing a Dive Light: Lumens, Beams and Backups

Even by day, a dive light reveals colour that water filters out. At night, in wrecks or in low visibility, it is essential. Here is how to choose one.

Lumens are not the whole story

Lumens measure how much light the torch produces, but not how it is used. A very bright torch with a wide beam will light a large area, while the same output in a narrow beam throws light a long way. Choose based on the diving you do.

Beam angle

• Narrow beams (spot) reach far and are ideal for signalling and for looking into cracks.
• Wide beams light a larger area and suit photography and video.
• Adjustable beams give you both in a single torch.

Canister vs handheld

Handheld lights are compact and suit most recreational diving. Canister lights mount a battery on your belt or tank, giving longer burn time and higher power, and are common in technical diving.

Burn time and batteries

Check the burn time at the stated brightness. Rechargeable lithium batteries are common; confirm any airline rules for travelling with them, and carry them in hand luggage as required.

A backup is non-negotiable

If your primary light fails in a wreck or at night, you need a second one. Small backup lights are inexpensive and easy to clip to your BCD.

Care

Rinse after each dive, check O-rings and lubricate them as the maker recommends, and charge before storage.

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