What does Lumen mean on a projector?

Related questions

1. Do LCD projectors have lifespan?
2. How do I choose a good projector?
3. What is DLP projector?
4. Are Projectors any good?
5. How do you check the life of a projector lamp?
6. Are projectors better for your eyes?
7. Do projectors overheat?
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9. How many lumens should a projector have?
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Tags

1. #projector
2. #being
3. #specifications
4. #measured
5. #projectors
6. #brighter
7. #lumens
8. #lumen
9. #rating
10. #range
11. #higher
12. #white
13. #equal
14. #likely
15. #color
16. #brightness
17. #which
18. #shopping