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While fisherman have been using White Light for many years, more and more fisherman are discovering Color can make a difference. Recent studies have shown that many times Green Light can penetrate darker waters better than White Light. Does that mean you should throw away your White Lights and fish only with Green Light or Blue Light? Of course not. But, if the fish aren't gathering with the light you are using, you may want to think about changing to a different color of light, much like you would change colors of lures if the fishing was slow.
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Light Visibility at Depth and Distance
White Light is made up of all colors in the spectrum. When white light passes through pure water the various wavelengths are absorbed at different rates. The long wavelengths (reds) are readily absorbed by the water molecules while the shorter ones (violets) are absorbed at a slower rate and penetrate further into the water.
The longer wavelengths (reds and oranges) are absorbed nearest the surface, so at depth these colors are no longer visible. The deeper you go or further away from the light source you get, the other wavelengths are also slowly absorbed, until there is no light visible at all. Reds and Oranges are absorbed first and then Yellow wavelengths start to disappear, then Green. Blue, Indigo and Violet penetrate the deepest and are visible the longest underwater. For more information on this process see Fishing Light Attractor.
The below Figure shows the depths to which various wave lengths of light penetrate crystal clear ocean waters at noon on a calm summers day. As you can see other than Violet, Blue Light penetrates the deepest while still maintaining it's brightness.
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So which color of light is the best color to use? Which color of light to use can vary on a nightly basis, so if you're not attracting a good number of bait-fish with one color, change to another color. Most of the time though, White Light and Green Light are the best colors to use in fresh water and Blue Light works well in deep clear saltwater. The key to attracting any species of game fish is attracting the bait-fish. Once the bait-fish come to the light, the game fish will be close behind. We recommend using two lights, one White and one Green to see which light attracts the most bait-fish. You can then switch both lights to the color that is attracting the most fish. If you are fishing in deep saltwater, add Blue to the mix.
So, the answer is to experiment with different colors of light just as you would change colors of fishing lures. Conditions and water clarity change on a daily basis, and in order to catch fish consistently you have to be able to change your light and lures to match those conditions.
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