the light of (one's) life
The most beloved person in one's life. Eva has been the light of my life ever since I first met her 70 years ago today. To my darling son Jonathan, the light of my life, thank you for all of your support and encouragement in pursuing my dream to open this restaurant.
the light of your life
a much-loved person.the light of somebody’s ˈlife
the person somebody loves more than any other: Elizabeth was his only child, the light of his life.