How many watts is a lumen?

Related questions

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3. How do you calculate luminous efficacy?
4. Is effectiveness and efficacy the same?
5. What does efficacy mean in education?
6. What does efficacy mean in drugs?
7. What are last rites called now?
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Tags

1. #indicates
2. #gives
3. #compared
4. #equivalency
5. #brightness
6. #incandescent
7. #watts
8. #chart
9. #lumens
10. #replacement
11. #produce
12. #purposes