What is needed for Night Light to work?

Just a wild guess - but recommended components to keep shown in pic.
Don't forget to check Recommended in Compatibilty tab.
 

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Color management is crucial if work pro with picture or video editing and needed for at lot of software regarding this.
Think Nightlight is a build-in ICM profile in Windows you can switch between.
Even your monitor/ TV/ flatscreen have color profiles defined from vendor -and stores selling it they happily convience you to buy insurrance and calibration too even they know you don't need it.
 
In addition, NTL has a built-in search function for the components needed for your finished image.
For example, as shown, necessary Compatible components can be searched via the Extra Info column.
Sorry I didn't state that in my answer, which nuhi elaborates on - thanks.
 

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What other enhancements does this component have besides night light?
It is most useful on laptops, to have screen brightness adjustment it is necessary to keep these components and services in default.

I don't know if without this it is possible to adjust the brightness using Mobility Center or keyboard shortcuts, I don't have a laptop to test, I used a borrowed one with a defective native keyboard to do some quick tests. As I had to deliver quickly I couldn't do deeper tests.
 
It is most useful on laptops, to have screen brightness adjustment it is necessary to keep these components and services in default.

I don't know if without this it is possible to adjust the brightness using Mobility Center or keyboard shortcuts, I don't have a laptop to test, I used a borrowed one with a defective native keyboard to do some quick tests. As I had to deliver quickly I couldn't do deeper tests.
For desktops is this needed since I don't dim the screen?
 
All those features adjust (skew) the display profiles. If you don't have them, then your display defaults to whatever the graphics driver wants to output. Even then, your driver utility (ie. Intel Control Panel) can do something similar.
 
For desktops is this needed since I don't dim the screen?
This feature is not for dimming the screen, what it does, is to shift the blue light of the screen to orange/red for eye protection, useful if working at night, this feature is in most recent smartphones.

Other free tool that I have used in Windows 7 with some features like setting the temperature color with gradient auto shift for a specific time of the day, is f.lux from JustGetFlux.,
 
For desktops is this needed since I don't dim the screen?
No, for desktop the only use I know of is night light. But you can use third party tools like f.lux mentioned by Kasual which doesn't need a service running in background all the time to work as night light needs.

EDIT:
I completely forgot about Image Color Management (ICM), this is recommended to keep as it is used by many programs.
 
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This feature is not for dimming the screen
He is referring to the components mentioned by francis11 in that post. These components are used in the latest builds of Windows 10 for screen brightness adjustment as well. On version 1607 and earlier Windows this was not necessary. Without this the brightness slider in Settings or Action Center does not appear. But this only appears on laptops so for desktops it's not very useful.

EDIT:
I completely forgot about Image Color Management (ICM), this is recommended to keep as it is used by many programs.
 
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