I always dive with a small one, but it certainly isn't essential. Most dives can be done without.
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To each his own; many times I could dive without a light source but I choose not to. It's rare that I never turn my light on on a dive. One use of a light I have, for example, is in swimthroughs when I am behind my wifebuddy. We have an understanding that I will keep shining my light past her where she can see it as a "OK" indication so that she doesn't need to turn around to check on me. If I were to move it rapidly back and forth in front of her (it has never happened), that would be a "NOT OK" signal.I always dive with a small one, but it certainly isn't essential. Most dives can be done without.
A decent light is always nice to have even in the Caribbean for looking under ledges, overhangs, swim throughs, etc. I don't splash without one. If you wish to do any night diving you will need at least two lights plus a marker light for your tank.
All mine use alkaline batteries, so I bring a lot of them. Any I don't use I give to the dive shop when I leave.For those that bring lights, do you bring chargers also? Or just extra batteries?