Prior to 1761 humans only used fire generally in the form of a candle to spread light. In 1761 Ebenezer Kinnersley demonstrated heating a wire to incandescence.
In the years to come, many men tried to improve on the electric lightbulb. Thomas Edison began serious research into developing a practical incandescent lamp in 1878. Edison filed his first patent application for "Improvement In Electric Lights" on 14 October 1878.
Throughout entire 19th and 20th centuries men kept trying to make a better lightbulb. In 1995 Shuji Nakamura at Nichia labs invented the first blue and, with additional Phosphor, white LED. This started the LED boom.
Now we are controlling our lights with software, our cell phones.
This is innovation! If these pioneers did not take the steps to make light better, we might not have computers.