My image file sizes are much smaller after editing and exporting through Lightroom. Is it impossible to maintain original file size to preserve image quality? Will this smaller file size have negative impact on prints? Any help is appreciated!
File size is not an indicator of image quality! You are looking at the wrong measure.
File size is determined by the number of pixels you have, the quality slider in the Export dialog box, and about a dozen other things, most of which you can't control.
You want to look at the number of pixels (height and width) and not the file size.
Is it impossible to maintain original file size to preserve image quality?
Not only is it impossible, it is also meaningless (see above)
Will this smaller file size have negative impact on prints?
Instead of looking at the file size, you need to look at the number of pixels in the exported photo (width and height), and this will determine if you will get a decent print. The usual standard is that you need 300 pixels per inch.
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