ray of light

NOUN
12 LETTERS · STARTS WITH R

ray of light is a valid 12-letter word worth 20 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1A1Y4O1F4L1I1G2H4T1
1 + 1 + 4 + 0 + 1 + 4 + 0 + 1 + 1 + 2 + 4 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does ray of light mean?