Gaslight

Gaslights were a form of lighting that were first used in London around 1840. This enabled the city to have a thriving night life.

Blackthorne Gasworks provided the gas for many of these lights and so Morjanus chose it as the location for her proto-morphic lifeform. After three years, the lifeform was fully intergrated to the gas system. It caused the lights to shatter and Pyrodines to be released from them. (DWM: The Curious Tale of Spring-Heeled Jack)