Why is Luke's lightsaber blue in the last Jedi?

Related questions

1. Is ahsoka a Jedi?
2. Does Ahsoka become a Jedi Knight?
3. What happened to Ahsoka Tano in Star Wars?
4. What Jedi has a white lightsaber?
5. What race is Mace Windu?
6. Why does Luke's lightsaber change?
7. What is the age difference between Anakin and Ahsoka?
8. Did ahsoka Die in Order 66?
9. Could Mace Windu have survived?
10. What does the black lightsaber mean?

Tags

1. #force
2. #shattered
3. #standoff
4. #kanata
5. #given
6. #vader
7. #strikes
8. #darth
9. #during
10. #lightsaber
11. #kenobi
12. #empire
13. #cloud
14. #awakens