Britannica
Sources used in this answer
How powerful was the light at Helgoland Lighthouse in 1913?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
lighthouse
Lighthouse at Portsmouth, New Hampshire.
In 1913, the Helgoland Lighthouse, located in the North Sea, was equipped with carbon arc lamps and searchlight mirrors, producing a light of 38 million candlepower. At that time, it was considered the most powerful lighthouse in the world.1