https://www.theverge.com/2018/7/13/17569330/apple-true-tone-tech-lg-display-ultrafine-macbook-pro-2018

Apple’s True Tone technology on the new MacBook Pros will apply to some external displays. The company published a support document today that details which displays will work with True Tone. They include: Apple’s Thunderbolt Display, which uses the Apple Thunderbolt 3 to Thunderbolt 2 adapter, LG’s UltraFine 5K, and LG’s UltraFine 4K.

True Tone allows Apple devices to measure the light in a room to strike the proper color balance and intensity on-screen. It’s supposed to make displays less harsh and easier on the eyes. Up until now, it’s only been available on the iPhone X and the iPad Pro.