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During World War One it was a way to save energy resources such as coal, using fewer electric lights and less heating during the lighter evenings and being more productive.

The Orange County Plain Dealer reported that biplanes flew above the crowd, outfitted with electric lights — one looked like “a large, fiery cross,” while the other flashed “KKK.”

Christianity adopted some of these traditions, and starting in the late 19th century, electric light helped the holiday decorations become a secular cultural tradition in Europe, America and beyond.

Festivities feature devotional songs, decorative structures called “pandals,” burning of incense and electric light displays depicting stories from Buddha’s life.

The brain, she said, processes electric light — not just a smartphone’s much-maligned blue light — as sunshine.