Bagginsbill:

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Warning! These are not HDR images, despite what the group title says. They were made using HDR techniques, but they are LDR images and do not have high dynamic range.

Oh, I was not aware of it. I'm really an amateur when it comes to photography and technique.

vincebagna:

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Carodan, on my site you will find several useful links to great quality HDR maps (and some are lower quality). Some of them are equirectangular, some are probes (you'll have to make them equirectangular by yourself):
http://www.vincebagna.com/index.php?option=com_neoreferences&Itemid=157&catid=4

Very helpful, already used two of them in my renders thanks to the links on your page.