Searchlights

Searchlights are broad-beamed, high-intensity artificial lights constructed so that it can be swiveled about used on board to illuminate the deck or nearby waters. The Royal Navy used searchlights in 1882. Searchlights were installed on most naval capital ships from the late 19th century through WWII, both for tracking small, close-in targets such as torpedo boats, and for engaging enemy units in nighttime gun battles.