Hi Maga. If you ungroup the lights but still leave them all selected, you can edit the collectivly all at once ,they will all retain the same attributes. then just regroup them after that if you really need them grouped. A sky plane can be selected from the Create menu,at the top. you will see a ground plane, a water plane, and a Sky plane , these are all infinite planes, and they go on forever. If you click and hold down the mouse button on one of these planes ,you can select a Volumetric Slab,(infinite Slab) but be prepared for a longer render, anyway.. from what program did you make and import this light ball? dont get discouraged. wEll figure this out 8 )~ Hawkfyr

“The fact that no one understands you…Doesn’t make you an artist.”