What are PAR light bulbs?

Related questions

1. What's the difference between daylight and sunlight?
2. How is Par Value calculated?
3. How do you convert Lux to Ppfd?
4. What is a par sensor?
5. What is par spectrum?
6. What is par and how does it help your plants?
7. Are lumens important for growing?
8. What is Ppfd?
9. How bright is a Lux?
10. What size grow light should I use?

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19. #aluminized
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22. #dividing
23. #which