the light of somebody’s life
US /ðə laɪt əv ˈsʌmˌbɑdiz laɪf/
UK /ðə laɪt əv ˈsʌmˌbɑdiz laɪf/

1.
la luce della vita di qualcuno
a person who is extremely important to someone and makes them feel happy and complete
:
•
His granddaughter is the light of his life.
Sua nipote è la luce della sua vita.
•
After they adopted the child, she became the light of their life.
Dopo aver adottato il bambino, lei divenne la luce della loro vita.