Free HDR Environment Maps by ZBYG
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Hi,
I have found these maps (free, but I am not the author)
They look just great with iRay...
My favorite is Studio010, I often use it with strength of 2
For usage permissions, refer to the link: I am not liable for any abuse
Comments
All three sets are pretty nice and very useful for 'studio' type lighting. They also work rather well for things like large indoor spaces, if you use actual geometry for walls and such. They aren't very good 'backdrops', though. Not that they can't be, just not enough visual interest or detail to be 'good'.
Quite useful in 3Delight, too.
I really need to learn about HDRI