To clarify, I was speaking to broader claims of people saying f.lux puts them to sleep like a baby and the f.lux authors themselves claiming it as a tool in the fight against cancer and acne.<p>Note that f.lux does not even claim to prevent eyestrain. The closest they come is this: &quot;Our users say that f.lux prevents eyestrain.&quot; That&#x27;s hardly science; in fact it&#x27;s exactly how shady companies market vitamins.<p>Also, I don&#x27;t know what &quot;feels better on your eyes&quot; means but I will point out that if 2700K screens felt better &quot;in an otherwise dark room&quot; then movie theaters would use them. You say &quot;It&#x27;s that simple!&quot; but like most things, it&#x27;s a little more complicated than that.