How to decrease 'blue light' from my monitor?

Win 7

Is there a way using one(or more?) of the following to decrease the 'blue-light' coming from my monitor(and not use a downloaded 3rd party program):

1) Win 7...I've read that Win 10 has a 'night light' function, but not Win 7. Does anyone know of a way to do the same thing that 'night light' does, but on Win7?

2) Monitor:LG IPS LED 23MP57HQ-P...I've played with the 'color temp' and 'SixColor', but they destroy the 'just right' settings for brightness, contrast, GAMMA and saturation I have set up in my video card.

3) Nvidia Card:GeForce 9600 GT-using YCBCR444(seems to look better than the RGB setting) 

I know I could buy a 'blue-light' film or a PLASTIC frame that 'hangs' on my monitor...I'm just trying to find if there's a way to do this without spending money.
Ideas, anyone?

Thanks!    As you know Win 7 does not have this feature, but what I use is EyeSaver (Free) and works fine with plenty of adjustments, GET it here.
http://eye-saver.findmysoft.com/      Small download.