NAS has a weird system of capitalisation which i think paints them into a corner more often than not. who knows, but some overzealous translator here may have seen Light as a name of the divine!
After checking our files, we are sorry to say we do not have
that
information on hand to make available.
The original records or later comments from the original translators
regarding the passage you are inquiring about are not readily available from
our archives.
This is only a guess, but it could be due to the fact that John refers to Christ as the light in John 1:4, 9 and again in John 3:19. Jesus also refers to Himself as the light of the world in John 8:12 and 9:5 and also says that He has "come as a light into the world" in John 12:46.