1. The Sun. The Sun's purpose is to cover the earth in light. And most plants need the sun to survive.
2. Light Bulb. A light bulb's purpose is so we can see at when it's dark.
Other Light Sources
1. Fire
2. Streetlight
3. Flashlight
4. Glow-glue
5. Glow stick
6. Star
7. Glowing mushroom
8. Lantern
9. Booklight
10. Computer screen
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