Examples from literature

• Before the invention of the light bulb, you had to watch plays during the day when it was light outside. 
• Before the light bulb, people did not do much at night because it was dark. 
• Changing the light bulbs in your room can help you sleep. 
• Finally, in 1879, Thomas Edison invented a safe and easy way to use the electric light bulb. 
• If you look at a picture of our planet from space at night, you can see how the light bulb changed life on Earth. 
• Laser light does not spread out like natural light or light from a light bulb. 
• People used candles for light at night until the light bulb was invented. 
• Try changing the light bulbs in your bedroom.