Into the Light 

Here's a quirky promotional film from the Fifties. Make sure to watch past the fairly dry introduction and then you'll see the benefits of varied electric lighting demonstrated via the medium of dance (yes, really).
The irascible commentator here is Gilbert Harding, a popular TV face of the time, whose Waldo Lydecker-esque demeanour earned him the description "The Bilious Bachelor of Broadcasting" 😄 From ca. 1953.