The lights referred to on the other thread may have been something like the obfuscatingly named "Canal Defence Light", which was a special directional searchlight that emitted the beam through a narrow slit.
http://en.wikipedia.org/wiki/Canal_Defence_Light
Here's some photos I took years ago on Cramond with a film camera. Was trying my hand at some B&W post-apocalyptic shots but didn't really know what I was doing.
The British were quite into experimenting with lights as weapons, see also the less than successful Turbinlite and the vastly more useful Leigh Light. Then there were "Starfish" sites (http://en.wikipedia.org/wiki/Starfish_site), which were large installations of lights and fires designed to mimic airfields, streets or factories and also fires and bombs exploding, to attempt to decoy night-time visually aimed bombers from the genuine targets, which would be blacked out and/or camouflaged.
There were Starfish sites at Torphin Quarry, Cramond, Ratho and Braid Hills. You don't see much left behind as they were temporary structures of wood and barrels and ditches, although sometimes the control bunkers remain.
Other things that may be accessible include the AA Decoy Battery at Hilltown, near Shawfair. It's in the middle of a field but should be accessible.
Something that's definitely not accessible is the bunker at the back of Clermiston Hill (called Barnton Quarry) which was built during WW2 and later expanded in the cold war into a "ROTOR" air defence control bunker. But you don't want to go in there as it was burnt out in the early 90s and is full of Asbestos fibres plus the central floor is missing.
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