Secondly, HDRI is a much more intense light source image. Very rarely would I use a HDRI at 100% intensity. Here, I'll show you. In the two examples I have, the image used on the light is the same, except that one is an IBL and the second is a HDRI.

Here's the rendered image using the IBL.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8