Hi. I came up with the idea of making studio-lighting setups with 3ds max and render them into HDRI. I figured out how to do it, and here is the result. There is a site which i cannot remember right now that sell commercial-quality HDRIs similar to these, but they aren’t free :P. Resolution is 2000x2000 for the probe image and 2000x1000 for the latitude/longitude map.
I had to post them separately, 'cause CGtalk wouldn’t let me upload the zip containing both of them.