I’m new in Unreal Engine and wanted to know what the difference is between “Build lighting Only” and plugin “GPU lightmass” ?
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Hey @14BOBR14! Welcome to the forums!
The main difference here is “Build Lighting Only” is CPU, “GPU Lightmass” is GPU. Their goals are the same, but they way they get there is different and so you can get different results.
Because of those differences, “GPU Lightmass” is intended to be able to be used on the fly with slight changes in the environment. It is still in beta and not necessarily accepted as a finished product, so there is that.
Hope that helps you understand it a little better! 
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