Those of you who have been keeping track of Steam Update
news, probably already know that some months back Valve injected a bit of the
HDR lighting technology in to the Source Engine.
Theres to be a expansion comming out solely to demo
this technology.
Well I'm shocked at what graphics the HDR lighting
tech can create.
Take a look for
yourself.
Source: http://www.joystiq.com/entry/1234000817042939/