4. how did thomas edison’s invention of the light bulb affect industry? (1 point) electric lights made it possible for factories to run after dark. having better lighting largely eliminated industrial accidents. bulb manufacturing became the biggest industry in the united states. brighter lights made people more productive so they worked fewer hours.

The light bulb affected industry because electric light made it possible for factories to run after dark. Once factories could keep producing goods, even through the night, they were able to produce goods at a faster pace. They were also able to produce larger quantities of merchandise. This helped industry, especially with keeping up with the rapidly growing population's demand for certain items or producing war time necessities.