Peter
Just an update on Lubuntu.
I updated yesterday a D630 Dell laptop (CCFL, Intel driver) from 16.04 LTS to 18.04 LTS. With 16.04 no eye strain at all ever! Yesterday after 20mins i experienced a mild headache with some dizziness. I tested it and i am pretty sure is from Lubuntu 18.04.
I run sudo apt-get install xserver-xorg-video-intel to get an update but i have the latest version.