Often, lower-priced LED panels will have a color cast that can be difficult to correct in post, particularly if you're working with mixed lighting. This great video shows both how to detect the issue and how to correct it.
In this video, Tony Reale of Creative Edge walks us through the process. The idea is manually set a camera to the white balance the lights are rated for and shoot them lighting a white wall. From there, we import the photo into Photoshop or Lightroom and crank the saturation, which will make any color bias readily apparent. After that, the solution is simple: we gel the light with the color complementary to its bias.
If the light shows a green bias, we'll need minus green gels; if it shows a magenta bias, we'll need plus green gels. Most lights tend to show a green bias, requiring minus green gels. As Reale suggests, you can keep a list of the bias and compensation for each of your lights, making it easy to quickly and properly gel them on set. It's a great solution for working with cheaper LED panels.
Be sure to check out Reale's website for more.
[via ISO 1200]