The ideal dive light features to look for really depend on your preferences, but if you’re opting to buy a more expensive light, keep these factors in mind:
Brightness and depth rating
The most important feature to look for when buying a dive light isn’t necessarily the brightness, but how much you can adjust the brightness. Look for dive lights with at least a high and low mode, or more if you can swing the extra cost. This way you never have to deal with a too-bright or too-dim light when diving. When it comes to depth rating, it never hurts to go deeper. Even if you regularly stay pretty close to the surface, a higher depth rating usually indicates a more durable, tightly sealed light.
How long will the light last? If you are going to be underwater for longer periods, you will need a light that has a longer battery life. Remember that you do not want to go through the inconvenience of having to come out just to replace batteries, or to get another light. The brighter the light, the more powerful a battery it should have – always look for a light that has a battery with a burn time that’s double your typical dive length.
Size and design
Most divers like a compact dive light. They are easier to handle, use, and lighter to travel with. Lights with narrow designs are also preferable because when in aquatic conditions, you do not need something that will be too big in your hands – maneuverability is key.
After finding a dive light that has all of these features, you should also take a look at its quality. Polycarbonate and aluminum are ideal, both being more durable and reliable than other body materials. Other features to look for include double O-ring seals and products with anti-corrosive paint jobs and finishes to prevent damage from salt water and debris.