One of the Gurn's readers has drawn our attention to more information on the Highland Council website:
'The Highland Council is supporting the WWF’s Earth Hour 2010 and on Saturday 27 March will be joining million of people across the globe by switching off lights to seven prominent landmarks for an hour in a demonstration of support for people and wildlife threatened by climate change.
From 8.30pm to 9.30pm the floodlighting to Inverness Castle, the Cathedral, Ness Bridge, the Hector Macdonald Monument in Dingwall, the Ross Institute in Halkirk and the Thomas Telford Bridge in Helmsdale will be switched off, while in Lochaber every second lighting column along the Caol to Kilmallie Road will be turned off.'
Why not leave them switched off all the time? Suggests a concerned resident of Gurnshire.