Some lights, such as Big Blue, come with a yellow (warm) filter as a standard accessory.
But what does it actually do?
Generally speaking, warmer light is often more visually appealing and easy on the eyes. If you white balance your camera to an underwater scene at depth, the camera shifts the color spectrum and the yellow filter may help make your colors (especially yellows, reds, and blues) pop.
The end result can be much nicer colors overall, especially in video.
Blue filters are also common on strobes – they are used to prevent your white lights from appearing too red, after you have white balanced your camera to a bluer scene.
Just as an aside, yellow filters are also used for fluorescence photography, but they’re usually applied on the camera lens itself. With this filter, and strong blue lights, you can achieve amazing fluorescence shots.
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