How many light bulbs were installed on the Titanic?

About 10,000 light bulbs were installed on Titanic.

The ship’s electric lighting system was remarkably extensive for 1912. Titanic used thousands of incandescent lamps throughout its passenger spaces, working areas, machinery areas and service corridors. Contemporary descriptions of the Olympic-class electrical equipment put the number of lamps at approximately 10,000 on each ship, with Titanic having a similar installation to her sister Olympic.

The lamps varied in brightness, ranging from about 16 to 100 candlepower. Power came from four steam-driven generators rated at 400 kilowatts each, supported by two smaller auxiliary generators. More than 200 miles of electrical cable were fitted aboard each ship, illustrating how much infrastructure was required to illuminate a floating city.

The figure is an approximate count, not a modern inventory of individually documented bulbs, so “10,000” is best understood as a rounded contemporary estimate. It is also separate from Titanic’s electric bells, of which roughly 1,500 bell pushes were installed on each ship.