How to add an f.lux effect to an image?

[Saraling]

I need to do a side by side comparison, of two images, one with the f.lux effect, and one without.

But I want it to be accurate, not merely a "tan tint overlayed on an image".

Does anyone know how to do this in photoshop?

If anyone even has a simple rgb color of what "white" is supposed to look like accurately using f.lux, I can use that to do a color fill on a blank layer, and then make that transparent by using tools like peel off white.

Does anyone know the rgb color that "white" turns into when f.lux is applied?

Or any other way to accurately render an image with an f.lux effect?

Thanks!