That HDR Shader is nothing but a nicer looking bloom with some faux-hdr effects. If you want real HDR, in A6 you won't come really far. Read here what HDR realyl means:
http://www.coniserver.net/wiki/index.php/High_dynamic_range_renderingThe problem is, that the A6/A7 engine do not operate with light ranges from 0-60000 but from 0.0 to 1.0. No matter what you do, you can only fake it, but you will never truly get HDR until it is being implemented into the engine.
