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Your images are in an Apple Mac package folder called Photos Library.photolibrary. You have to expand that package by right clicking on it and select Show Package contents. Then a group of other folders will show up. Look for one called Masters and copy that to some other place on your hard drive. From that new place you can import them into LR.
How do I locate the file on my iMac?
Sent from my iPhone 6+
It's in your Pictures folder inside your home directory by default. You can just drag the Masters subfolder straight from there onto Lightroom and when you select "include subfolders" in the import panel, you should see all images that are in Photos. Make sure you absolutely do not use "Move" in the import panel, otherwise the images will disappear from Photos. Copy is the best choice but will double hard disk space use. You can do add but if you remove an image in Photos, it will become unavailable in Lightroom.
Well, you cannot migrate your images directly from Photos App to Lightroom like Aperture.
You need to export out your images from Photos App and save it on the machine somewhere, then Lightroom would able to see your images and can import/Add your images in the software so that you can edit them further.
Also, you can refer the discussion on the same: Re: How to import photos into LightroomCC from Mac Yosemite Photos app?