I imported my iPhoto Library into Photos. I
How did you do that?
When you migrate from iPhoto to Photos, you do not import your iPhoto Library to Photos, but you open the iPhoto Library in Photos.
When you do that, Photos creates a second library to be used with Photos, that is sharing the original image files with the iPhoto Library. Both libraries together do not need much extra space compared to one library, even if the individual sizes look the same. See this document:
Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support
Six Colors: The (hard) link between Photos and iPhoto
The original iPhoto Library is saved on purpose, and I would not delete it so soon.
The Photos Library and the Migrated iPhoto Library are sharing the image files by hard links.
You would not gain any additional disk space by deleting the "iPhotos library.migratedphotolibrary", but would lose the opportunity to use your library again with iPhoto or to repeat the migration, if you should discover that some photos did to migrate correctly. The reported size of the library is misleading. The filesystem counts them twice, because hardiness look like regular files.
Wait with deleting the iPhoto library until you are very sure, that each and every photo migrated correctly, and you are happy with the workflow in Photos. Otherwise you cannot fall back on iPhoto for features that are missing in Photos:
Photos vs iPhoto: Features and Capabilities
TheNolanK
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