I suspect the trend would be even more extreme if multiplied by typical screen brightness over time!
However, barring that (i mean, midday sun is nearly impossible for me, in real life, too, right?), like websites, the backgrounds look brighter on my 1080p TV i have connected to the computer, even though it is set up for the correct colors, so windows understands that letting webdevs attack my retinas is unacceptable, at least.