Why is the light bulb still important today?

The light bulb provides an easy, safe, cost effective way to convert electrical energy into light. With the simple click of a switch, light is provided. There is no need for any chemical reaction such as burning which can be dangerous. In addition, light bulbs tend to have a reasonable life span and can be easily changed when needed. In today's society, with the increasing number of building which contain areas that are not exposed to natural light, the light bulb is important even during the day.