It's not exactly banning an outdoor light so much as regulating outdoor lights for the sake of public health.

And yes, it is reasonable to do so. For one, everyone's got to share the same streetlights. For two, if these lights really are harmful to sleep, then the cost of using lights that are engineered to not produce certain wavelengths is probably minuscule compared to the net public benefit, even if you only want to limit the criteria being considered to things that are easily assigned a cash value.

Mandating Flux on phones, on the other hand, is a very different proposition in every way but the most superficial of similarities. People can make their own decisions about their phone's color scheme, and those decisions don't really affect anyone else in any direct way.

Why not. I already use flux on my laptop and would love it if my phone supported that too.

http://www.macrumors.com/how-to/use-ios-9-3-night-shift-mode... https://play.google.com/store/apps/details?id=com.urbandroid...

Maybe it's just me, but Twilight never felt as pleasant as f.lux and redshift do on my PCs. Instead of changing the screen color, it seems to add a red layer over the content.

EDIT: It's not just me: https://forum.justgetflux.com/topic/2591/exactly-why-do-you-...

If you've got a phone supported by CyanogenMod, it has a very nice mode called "LiveDisplay" which will adjust the phone screen's colour temperature on the fly based on time of day and both the brightness and colour of the ambient light.