RAW files - .CR2 to .dng (Lightroom)

[Silverboarder25]

Hi all,

I've just been adding some pics I took from a recent family trip where I was shooting in RAW for one of the first times. I love the additional detail for post processing, WB and all, but I'm stumbling on a bit in the files. I had a bunch of .CR2 (RAW via a Canon 60D) files that didn't get added to Lightroom when I first tried. I then clicked the "add as .dng" option and now have a bunch of photo's in both file type. While trying to optimize and clean out my folders, what should I be getting rid of? The .CR2 files are larger, but aren't opened via Lightroom it seems.

Am I missing something? Any tips? Thanks!