I just checked with a polarizer, apparently leds are NOT polarized and I wonder how the person who said otherwise got his phd.
OLED and AMOLED screens appear to have polarized light because they have polarizer film applied to increase contrast in cost of brightness.
But there seems to be a $80 solution to turning led light source polarized by only killing 20% of the source brightness.
http://www.imagineoptix.com/technolo...ersion-system/
But then again, what the hell is "etendue"? Even google just gives few results with vague descriptions. Depending on what that is, a 50%-75% increase of it might make this conversion optics pointless. Wish they would respond to customer emails...