I just down loaded a few hdri images. to use with baggins bill env sphere.

when I unpacked them they had a series of different extensions on them.

the files were for a milkway system.

3 jpegs and the following

milkyway.ibl  (1k)

milkway_light.hdr  (67k)

milkyway_small.hdr  (6.5M)

Curious as to what the differences are with these and to use them properly with

the sphere.