They say RGB lights will make you get rid of old-fashioned color gels. This article shows exactly the opposite. You should keep your gels and even buy more.
The video shows a comparison between different brands of lights including HMIs, halogen, daylight-balanced LEDs, tungsten-balanced LEDs, and RGB LEDs. All tested RGB LED lights are of high quality.
Tim Kang from Quasar and Ted from Indy Mogul show us a test where they film subjects of known color under different lighting situations. The results are reviewed on a monitor to see if these objects are correctly represented. As you know, the HMIs and halogen lights give a fairly correct representation of natural colors when the footage is color corrected. This is what their tests proved as well. The next set of experiments were with white and tungsten-balanced LEDs opposed to LEDs with a programed "white," where the color "white" is composed out of red, green, and blue LEDs, not by a single white or tungsten-balanced light emitting diode. The results are quite shocking: the combination of red, green, and blue do not represent the natural color spectrum for colors we know and see. After you watch the video, you will know why if you care about color, you have to put a gel onto a white-balanced LED, not program it, even on an ARRI Skypanel.