Answer:
A major advancement in electric lights was the invention of the fluorescent light before World War II
Explanation:
The ongoing research on phosphor coated neon tubes that produce visible white light from ultraviolet light in Europe, resulted in research programs into fluorescent lamp lighting in the U. S., which had reached demonstration stage in the mid and towards the late 1930s, such as the World's fair demonstration in New York, 1939.
The fluorescent proved to be more efficient and long lasting than the incandescent bulbs that were in use back then.
