I find it jarring to switch from a dark window to something bright, for example from vim to the web browser. You basically said it yourself. It takes a lot of

I find it jarring to switch from a dark window to something bright, for example from vim to the web browser. You basically said it yourself. It takes a lot of effort to make everything dark. Instead I make bright comfortable. Around 5% brightness on the external monitor and f.lux active all the time with a pleasant middle setting.