Crews are dismantling the production traces on the LEDVANCE lightbulb manufacturing plant in St. Marys, Pa. The manufacturing unit was shut down after producing lightbulbs for more than a century. Crews are dismantling the production traces at the LEDVANCE lightbulb manufacturing plant in St. Marys, Pa. The manufacturing unit was shut down after producing lightbulbs for more than a century. A revolution is upsetting the lighting enterprise as LED lightbulbs exchange vitality-hogging incandescent ones. That is good news for consumers and EcoLight reviews the atmosphere