Fact · North Uist
The Monach lighthouse was replaced, then un-replaced
The Stevensons' Monach lighthouse of 1864 was switched off in 1942. After the Braer oil spill a smaller light was built beside it in 1997. That one was not bright enough, so in 2008 they turned the Victorian one back on.
Monach Lighthouse on Shillay was built in 1864 by David and Thomas Stevenson, the lighthouse-building family of Robert Louis Stevenson. It was closed in 1942 when the islands were abandoned. After the tanker Braer ran aground in Shetland in 1993, a small new light was put up on the island in 1997 with a range of ten nautical miles. When eighteen miles was judged necessary, the new light was shut down in 2008 and the old tower was recommissioned with a modern optic. It is still working.
Sources / notes: Wikipedia: Monach Islands https://en.wikipedia.org/wiki/Monach_Islands