Safe to delete Lightroom from my internal hard drive?

Hi
I shoot in raw and have been using Lightroom for approx 4 years, most recently Lightroom 4 and before that Lightroom 2. Lightroom is taking up a lot of disk space on my internal hard drive and my computer is not happy.
I have deleted all but a couple of backups and then copied all my Lightroom lrcat files to an external hard drive. Now, Lightroom will only open if I have that external hard drive plugged in. Great! That is what I wanted. Is now safe to delete my Lightroom files from my internal hard drive? I am not that computer savvy and I am also terrified of losing all my work.
Thanks

Well, if you have them on a single external drive and you delete them from your internal drive, then you have only one copy left, correct? In that case you are at extreme risk of losing your one and only copy.
I worked in the disk drive industry for 30 years and have my lrcat files backed up on three hard drives and two USB sticks. Maybe I'm just paranoid but it's likely a hard drive will eventually fail. And based on experience, for some Murphy's law reason they fail most often for people who have not backed up their data.
I'll bet there is all kinds of other stuff that can be removed from your hard drive, various temporary files, log files, etc. Try a free app like CCleaner (on Windows) to see what it does.
But I would not have just one copy of my latest lrcat files in existence.

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2) while launching iPhoto, hold down option key and select 'choose library' from the menu that appears and then navigate to the 'iphoto library' that I copied onto the new internal HD.
Yes
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