This is the 383rd most frequent Italian word.
luce
Light.
Here, 'luce' is used in its literal sense, referring to artificial lighting.
Accendi la luce, per favore.
Turn on the light, please.
Here, 'luce' is used abstractly to describe brightness or luminosity in artistic expressions.
Mi piace dipingere quadri pieni di luce e colori.
I like painting pictures full of light and colors.
In this instance, 'luce' is metaphorically describing the welcoming and positive presence of someone.