Use dark mode at night and you won't need Redshift any more. It's only relevant for white screens.
PS: This IS in fact the optimal solution - if not for you then for others. I used Redshift for years, suffering its periodic breakages, babysitting the timezone issue, and it was worth it, because a retina-searing reddish-white screen is better than a retina-searing whitish-white screen. But a dark screen is SO much better for my eyes than either of those. I can't believe I waited so many years to do that and I'm never going back.
Sure, images and video are the exception. But I figure that a redshift app can only help so much when a video suddenly cuts to a picture of a white sky. That's really another problem: choppy contrast. Only solution is to increase ambient light behind the screen.
I don't think you understand how the redshift app works then? It's not meant to stop bright lights, it is meant to remove blue light to mimic the light of evenings
Especially if they're dark (literally midnight) blue, which is what my screen currently looks like!
I'm going with my feelings on this one. To me, an untinted white screen is like a standard LED lamp - it screams "Morning! Time to get up!" (which is why my lamp is covered with orange cellophane). A (heavily) red-tinted white screen feels like sunset. And my dark screen feels like, well, midnight. I sleep like a baby so in my case the problem's solved.
What setup do you have that actually sets a dark background everywhere? In my experience there are always plenty of programs and web pages that stay white.
I always found that to be quite hit and miss. Works for plenty but often gives a flash of white before it kicks in and makes enough pages unreadable that I'd rather not bother at all! I'll give it another go and see if it's improved though.
So I basically use only terminal apps (black!), a couple of messengers (dark mode) and Firefox. And yes, the problem is the latter. For a couple of years I used the Dark Reader extension. It works, pages look great - BUT! nothing would solve the occasional white flash problem. Last time I checked, it's basically unsolvable by addons. Then I discovered the simple solution: Preferences > Manage colors and override the default colors! It works and it's native! Pages sometimes look a bit ugly but always readable and zero white flash. This is a pro tip that hardly anyone talks about, you saw it here.
Literally my first experience after installing dark reader is that it can't darken its own add-on page! Seems to be good for other pages so I'll give it a go for now.
Welcome to the dark side ! Once you have seen it, you can't unseen it ! White will always be to bright and your eyes will cry blood on every screen/webpage that doesn't have a dark mode !