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They were invented to help people see things in the dark.

Another answer:

Light bulbs were part of the continuing improvement of lighting systems. At first people had to rely on the sun. When they build buildings the only light came in through the windows and doors. Fires in the buildings then gave some light. Smaller brighter fires like candles or torches improved this. Kerosene lights were even better, Then came electric lights - no smoke or smell and they weren't a fire hazard! Fluorescent bulbs gave more light for the same power. Now LED lights are even more efficient.

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7y ago

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