[jlgreco]

When your monitor is displaying a white image, lots of white light is coming out. When your monitor is displaying a red image, lots of red light is coming out. F.lux makes white images tinged red. F.lux isn't about removing brightness in general.

Your clarification is confusing me even more, I don't understand what your confusion is at all.

[diminoten]

This isn't actually true.

When your monitor is displaying a red image, red light is coming out, but so is white light, because your monitor is not 100% light sealed. The backlight in your monitor is leaking through the edges of your LED screen.

So the question becomes, is that leaked white light enough to disrupt your sleep? No one's done any studies on this question, no one's looked into it, and so until they do, F.lux's effectiveness remains in question.

[jlgreco]

> "This isn't actually true."

None of what you just said refutes any of the following: "When your monitor is displaying a white image, lots of white light is coming out. When your monitor is displaying a red image, lots of red light is coming out. F.lux makes white images tinged red. F.lux isn't about removing brightness in general."

Lets get some basics out of the way here, since you seem to be confused about either what "white", "blue", and "red" light is, or you seem to be confused about what f.lux actually does.

"red" light is light that consists largely or entirely of visible light with long wavelengths. "blue" light is light that consists largely or entirely of visible light with short wavelengths. "white light" is light that contains a good but not necessarily perfect mix of all visible wavelengths.

When you decrease the color temperature of an image, you are reducing the amount of short wavelength light, not eliminating it. LCD imperfection is frankly irrelevant as some short wavelength light is still coming through by design. If you removed all short wavelength light you would just be left with reds and blacks. That isn't what f.lux does, or claims to do.

> "So the question becomes, is that leaked white light enough to disrupt your sleep? No one's done any studies on this question"

Many studies have been done on the effects of different intensities of short wavelength light on sleep. This research isn't binary "blue light or zero blue light" For example, any of the studies which include an incandescent bulb cover this. Incandescent bulbs are black body radiators, they emit short wavelength light and long wavelength light, however the proportion of short to long wavelength light that they emit is much different from what florescent bulbs emit. (Specifically, light from incandescent bulbs is said to be "warmer").

By the way, one of polyfractal's links is to a study that used LCDs as the light source. Try reading before making an ass out of yourself.