This .HDR Pack01 is a set of 10 High Dynamic Range Skies Domes ready to animate.
Average Texture Size for sky is 2880 X 1440.
Use these Skies Domes to create atmosphere in your project.

For much better atmosphere, use .hdr file in iClone Atmosphere set-up and enabled HDR Effect and IBL on.
How to do :
1/ On Prop texture settings select diffuse then save it as .HDR format
2/ Go on Stage tab/atmosphere. Activate HDR Effect and IBL on and load the previous saved image.
3/ Personalize the atmosphere by setting up parameters.