There are not many of these floating around (at the moment) but as I find them, I will map them here: http://goo.gl/maps/it1HS
The following photogarph is from the Irish Defence Archive’s Flickr Feed. You can click through to their feed – they have a photograph identification project under way at the moment.
Wicklow Head 9
Via the Irish Defence Forces Archive who have released it under Creative Commons
This sign is either overgrown or has been removed. The lighthouse in question is now a holiday home.