How many lumens should a projector have?

Related questions

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5. What is better DLP or LCD projector?
6. What is a good contrast ratio on a projector?
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Tags

1. #sufficient
2. #although
3. #lumens
4. #higher
5. #conference
6. #projecting
7. #clearly
8. #large
9. #rating
10. #brightness
11. #projector
12. #classrooms
13. #brighter
14. #rooms
15. #should
16. #images
17. #often
18. #addition