How high does UV index have to be to tan?

Related questions

1. Do freckles get darker when you tan?
2. Can you tan if it's windy?
3. How long should you sunbathe to get a tan?
4. How do you produce more melanin?
5. What is the best time of day to get a tan?
6. Can you tan if it's cloudy?
7. Is UV Index 11 dangerous?
8. Do you get more sunburned when it's cloudy?
9. Can you get tan through a window?
10. How much UV Index is safe?

Tags

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4. #minutes
5. #index
6. #person
7. #reading
8. #shade
9. #moderate
10. #between
11. #sunburn
12. #means
13. #average
14. #there
15. #approximately