What is a par meter?

Related questions

1. Are lumens important for growing?
2. What is micromolar equal to?
3. What is Lux in LED light?
4. What light frequencies are most photosynthetically active?
5. What is standard lux level?
6. What is par meter?
7. What's better lux or lumens?
8. How is Par Value calculated?
9. Can any LED light be used as a grow light?
10. What does par measure?

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24. #sensor