Can I choose to use f.lux on only 1 of my 2 screens ?

[Kelt-Wivers]

Hi there, thanks for f.lux ! It was a great help, especially since I couldn't afford a screen with eye care technology. That changed though, got myself a nice BenQ (connected via HDMI).
But I still have my crappy super bright eye piercing screen as a second monitor (connected with VGA).

So, it would be perfect if I could use f.lux only on my second monitor. I know it's kind of the opposite of many threads I saw where people explain that f.lux only work on 1 display when they want it to work on 2 or more screens. So, is there a way to do that ? Only use f.lux on my VGA connected screen ?

I'm aware that's not a major problem, but if someone has an idea that'd be cool !

thanks !