Night Shift is based on time and sunset/sunrise data, not ambient conditions (perhaps you're thinking of True Tone).Either your Mac or the display would need some kind of sensor to measure the environment lighting. No sensor, no Nightshift. Get the f.lux app. https://justgetflux.com/news/pages/macquickstart/
It's meant to be a feature. If you're using a TV or a projector with your Mac - rather than a monitor - then typically you will not be sitting very close to the screen, making Night Shift pointless, and will probably be using it for watching movies or TV shows, making Night Shift unsuitable.That's disappointing why would Apple not allow 3rd party display to take advantage of night shift, If flux can work then night sift should work.
It's meant to be a feature. If you're using a TV or a projector with your Mac - rather than a monitor - then typically you will not be sitting very close to the screen, making Night Shift pointless, and will probably be using it for watching movies or TV shows, making Night Shift unsuitable.
The release version might add a manual override for people using TVs as monitors.
MY 2012 13" MacBook Air doesn't have Night Shift available and I only use it with the native screen, nothing external. Is it possible that it isn't supported on older models?
MacDann
if you're running a 10.12.4 beta, and it's not showing, then it's probably not supported. you are on the beta?