By admin 
Night Light Scheduler is a new GNOME Shell extension that lets you control how warm your screen is throughout different parts of the evening (or day).
GNOME’s built-in Night Light feature has a customisable schedule, and it lets you set a colour temperature that’s very orange, or less orange to filter out blue light. But that temperature holds the entire time Night Light is switched on. It eases in and out at each end but never changes in between.
For most use cases, the default behaviour is fine; set and forget to a schedule.
But if you wish you could vary the colour temperature during the course of the day, Night Light Scheduler gives you the ability.
You could have a cooler value in the early evening, before gradually climbing in warmth each hour until a deeper tone last-thing-before-bed.
As well as setting up to 7 colour temperatures (from 1500K to 6500K) your display uses at specific times of the day (in 15m increments), you can adjust the transition period between them (0 to 120mins).
A higher transition time offers a subtle, smoother segue between values (which is harder to notice). A lower transition time means a faster ramp between values (instant, but the transition can seem jarring).
Schedule configurations can be imported and exported as an editable .ini file.
If you want to try it out, this extension supports GNOME 46 (Ubuntu 24.04 LTS) through GNOME 50 (Ubuntu 26.04 LTS). You don’t need anything additional; it makes use of GNOME’s built-in Night Light feature.
Install it from the GNOME Extensions website via your browser, or, for less hassle, install the Extensions Manager app from the Ubuntu repos and search it out in there.