Quote:
Originally Posted by Tom_Bombadil 
Perhaps you didn't know it because it doesn't actually happen.
http://www.polar-ray.com/FAQ_ep_40.html
Someone might think they do because when they switch on a bright LED light their eyes may not be adjusted to that brightness yet and then after a minute, and after your pupils adjust, they might not look quite as bright. But they will measure to the same brightness.

Perhaps you didn't know it because it doesn't actually happen.
http://www.polar-ray.com/FAQ_ep_40.html
Someone might think they do because when they switch on a bright LED light their eyes may not be adjusted to that brightness yet and then after a minute, and after your pupils adjust, they might not look quite as bright. But they will measure to the same brightness.
that link is based on actual measurements with a light meter during the first hour or so the display has been running after being off for a long time... so at the very least the LED-LCD display measured in that article did dim from its initial brightness before stabilizing





























