Can I delete previews, now that I have 'Smart Previews'?

Lightroom 5 spent hours creating 'smart previews' for all of my photos, but there are still 29,786 previews in 28,436 folders(???) on my computer.
How can I safely delete them to save space?
Can anyone explain why there are so many folders? None of them, that I've examined, contain more than 5 files.
thanks in advance
Steve

SteveF1948 wrote:
Trawling through 28k folders must surely adversely affect performance of the whole machine.
I think it does not, because a) LR will normally fetch only a few previews per second from the cache at most (if you browse very fast) - or at least for a limited time (page up/down in grid mode), and b) the folder hierarchy is very flat (two levels inside the preview folder, e.g. "xy Previews.lrdata\8\8A80"). This is a commonly used pattern to build a "quasi indexing system" to find files very fast, relieving the file system from a possibly lengthy search operation on a flat folder. It should not have a negative impact on the performance IMHO - on the contrary.

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