"simulating the human eye getting used to overbright areas" - and vice versa!
Can't wait for that!
When you achieved that, I would like to see the HDR within a picture with a high range of different brightness, if you don't mind.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt