The first successful arc lamp was developed by Russian engineer Pavel Yablochkov, and used the Gramme generator. Its advantage lay in the fact that it didn't require the use of a mechanical regulator like its predecessors. It was first exhibited at the Paris Exposition of 1878 and was heavily promoted by Gramme. The arc light was installed along the half mile length of Avenue de l'Opéra, Place du Theatre Francais and around the Place de l'Opéra in 1878.