ECN Forum Forums General Topics of the Trade General Discussion Area Daylight harvesting - a new old idea?

I assumed that daylight harvesting was a relatively new technique, originating in recent concerns about the environment, sustainability, etc.

So I was surprised to see the following item on p. 32 of the June-July 1935 issue of “National Radio News”, a publication of the former National Radio Institute home-study school:

“In Wallach Bros. Store, Fifth Avenue, New York, illumination is kept constant by photoelectric tubes. Regardless of fluctuations in daylight, the interior of the store is always well lighted. These tubes automatically function to turn off and on enough lamps so that a constant degree of illumination is maintained”.