luminous efficacy

17 LETTERS · STARTS WITH L

luminous efficacy is a valid 17-letter word worth 31 points in Scrabble and 37 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1U1M3I1N1O1U1S1E1F4F4I1C3A1C3Y4

1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 4 + 1 + 3 + 1 + 3 + 4 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does luminous efficacy mean?