From the February 11, 1933, issue
By Science News
YELLOW SODIUM LIGHT EFFECTIVE OUTDOORS
A commercial application has been found for the extremely efficient sodium-vapor lamp. A highway in Holland is now illuminated with these light units giving off an intense yellow glow; and this light, which makes color discrimination impossible and is devastating to Miladys makeup, is said to be especially desirable for outdoor illumination. The monochromatic character of the light apparently assists vision at the low intensities that prevail out of doors.