The Helios AG für elektrisches Licht und Telegraphenanlagenbau was a German electrical engineering company. Founded in 1882 it existed until its liquidation in 1930. The company was based in the town of Ehrenfeld, which was incorparted into Cologne

Cologne

Cologne is Germany's fourth-largest city , and is the largest city both in the Germany Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants.Cologne is located on both sides of the...

 in 1888. The company is nowadays mostly known for the Heliosturm, a lighthouse

Lighthouse

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

on the former site of the factory that was constructed for test and research purposes.