I had a walk down to this on Sunday morning. It lies behind the Alltshellach Hotel in North Ballachulish. Please ask permission to visit, the owners didn't know of the existence of this rock, although they do now. From the side door of the hotel follow the track down through the grounds to an old jetty with a couple of iron mooring rings on it. Look south, and you'll see two iron fence posts on the rocks of the promontory. Head for the western (right-hand) one, taking care as the rocks can be pretty slippery. When you reach the iron pole, look down at your feet....
Some nice weirdness for the general area, for those who like to make earthlights / prehistoric spot connections.
It is not necessary to look abroad for "spectral lights." In the sea loch which severs Appin from Mamore, and between Ballachulish Hotel and Glencoe, the lights abound[..] When I was at Carnoch House last year, opposite Invercoe, an English friend of mine observed the light closely, and about 10.30 p.m. in late August, the Ballachulish villagers turned out to stare and wonder. The lights moved rapidly down the road to Callert, then climbed the hill side, then went down to the shore of the loch. My friend could form no theory to account for their nature and movements, which are rapid. The country people have various hypotheses, all supernormal. No doubt there is a natural explanation, but, so far, conjecture has been baffled. They are not corpse lights, for they are visible to all, not merely to the second-sighted.
Folklore, Vol. 12, No. 3. (Sep., 1901), pp. 343-344.