hdrexposure

hdri exposure

no plugin - 1h30min - 16x48_enhaa	no plugin - 35min - 8x24 - enhaa
plugin - 50% blackpoint - 25min - 8x24 - enhaa	plugin - 80% blackpoint - 25min - 8x24 - enhaa

all images with raytraced reflections, ray recursion 2, same brightness for image world
check the reflections and the shadows, you can see, the more you level the hdri the more you lose the shadow direction and the reflections but the less you get noise.