Why was the light bulb an important invention?

Answer 1

Because it was a breakthrough of technology. If we did not have the lightbulb today, you probably wouldn't have the computer, or the iPod, or the tv, or other things like that.
Without this invention we would still be spending our days and nights in darkness.Unless you prefer the use of candle light, oil lamps, camp fires and the such all the time, light bulbs are an important part of our daily lives because simply

speaking they provide the light we need in order to see.

The invention enables us to be able to conduct work at night. This greatly improves productivity, enhances the quality of our life, and reduces crime rates. Personally, I think the wheel is the most important invention. It's the precursor to technology as we know it. The link below provides more insights on this topic.

it is important because it gives us light we could see in the dark