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but how often do most people have controlled LD's
Although I think most of us agree there are many levels and divisions of clarity to a lucid dream. All lucid dreams from my take would be a controlled Lucid dream. Otherwise it would not be lucid.
Umm... What I've understood is that a dream is lucid if you're aware that you're dreaming. The ability to control is just extra, but not necessity as the only think that really matters is that you're aware of the dream.