I have a number of Bacon books. The LC has almost no coverage in them. There really isn’t much info anywhere except in assorted articles in assorted magazines that cover the vintage bike scene.
There is likely as much good info on this forum as exists anywhere. You just have to find it all.
There were 190 built. 45 or so are known to exist. I have seen 3.
I suspect more than 190 were built since there were 2 distinct models built. The Lightning Clubman (190 allegedly built) with rear sets, solo seat, and Clubman bars, the Lightning (unknown # built) with dual seat, standard bars, and standard foot pegs. Both were based on the US spec Lightning Rocket with high compression pistons and a CR gearbox. The CR box also shows up in some Hornets and some US spec LR’s. I believe some CR LR’s ended up in Oz as well. Most of the “Lightnings” I have seen evidence of are in Oz.