radiant efficiency

18 LETTERS · STARTS WITH R

radiant efficiency is a valid 18-letter word worth 31 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1A1D2I1A1N1T1E1F4F4I1C3I1E1N1C3Y4

1 + 1 + 2 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 4 + 1 + 3 + 1 + 1 + 1 + 3 + 4 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does radiant efficiency mean?