Correct me if i'm wrong, but lightning is usually associated with Cumulonimbus clouds.
And correct me if I am wrong, but to avoid lightning, you simply dont fly near Cb.
Mind you, if you want to get home at all, in one piece Cb is best avoided. Which begs the question, why do you then need lightning protection?
*mind you, this is a bit of a thread hijack, so apols*
ben