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Can I Put a Flashlight Under Salt Water?


Are you planning on taking your flashlight with you on a scuba diving or snorkeling adventure? Or maybe you dropped your flashlight into the ocean and you're wondering if it's safe to use underwater? The question you might be asking yourself is, can I put a flashlight under salt water?

The answer is yes, you can put a flashlight under salt water, but there are certain considerations to keep in mind before doing so. In this guide, we'll discuss everything you need to know before taking your flashlight into the ocean.

Understanding the Science

Light behaves differently in water than in air. When light enters water, it slows down and bends due to the difference in density between air and water. This causes the light to scatter and absorb differently, resulting in a reduction in visibility. Salt water can also affect the behavior of light, absorbing and scattering light differently than freshwater due to its higher salt content.

Factors to Consider

When considering whether to put your flashlight under salt water, there are a few factors to keep in mind.

Waterproof Rating

The first factor to consider is whether your flashlight is waterproof or not. If the flashlight is not waterproof, it should not be put under salt water as it could damage the flashlight. If the flashlight is waterproof, it may be able to function under salt water, but the effectiveness of the light may be reduced due to the way that salt water absorbs and scatters light.

Lens Material

The material the flashlight's lens is made of is also an important factor to consider. Glass lenses are less likely to scratch and are more durable than plastic lenses. However, plastic lenses are less likely to break and are generally more affordable than glass lenses.


The brightness of the flashlight can also impact visibility in salt water. The brighter the flashlight, the better the visibility will be, but it may also attract unwanted attention from marine life. It's important to strike a balance between brightness and not disturbing the natural environment.

Precautions to Take

If you decide to use your flashlight under salt water, it's important to take precautions to ensure the safety of the flashlight and yourself.


Before submerging your flashlight in salt water, ensure that it is fully waterproofed. Check the manufacturer's instructions to see if the flashlight is rated for use in salt water.

Cleaning and Maintenance

After your underwater adventure, be sure to clean and maintain your flashlight properly. Salt water is corrosive and can damage your flashlight if not properly cleaned and maintained.

Consult the Manufacturer's Instructions

If you're unsure about whether your flashlight is suitable for use in salt water, consult the manufacturer's instructions or contact customer support for more information on the flashlight's capabilities.


In conclusion, yes, you can put a flashlight under salt water, but there are important factors to consider before doing so. Ensuring that your flashlight is waterproof, taking into account the material of the lens, and finding the right balance of brightness are all important factors to consider. Taking proper precautions, such as waterproofing your flashlight, cleaning and maintaining it properly, and consulting the manufacturer's instructions, will help ensure that your flashlight stays safe and functional.

Remember, safety should always come first when exploring the ocean. Happy underwater adventures!