primary color for light

NOUN
23 LETTERS · STARTS WITH P

primary color for light is a valid 23-letter word worth 36 points in Scrabble and 40 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3R1I1M3A1R1Y4C3O1L1O1R1F4O1R1L1I1G2H4T1
3 + 1 + 1 + 3 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 0 + 1 + 1 + 2 + 4 + 1 =36 PTS
DOUBLE WORD → 72TRIPLE WORD → 108
MEANING

What does primary color for light mean?

NOUN · 1 SENSE
1

Any of three primary colors of light from which all colors can be obtained by additive mixing.