".....because these will all interfere with the IDL cove...and if i disable the cove or make it invisible then i can add all the outdoor scenes and backdrops...but the quality of the light dedreases...because the cove is not visible anymore."

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***You can scale up the dome/cove to fit your scene. And/or, you can use visible in raytracing/light emitter, but not in scene/camera - to have it work but not visible - read the manual on these functions.