Detail of Lightolier Lytegem advertisement from LIFE magazine, Nov 18, 1966.
Tensor was an American company founded by Jay Monroe in 1957. It became famous for the invention of a sturdy high-intensity desk light specifically aimed at students and was widely used in schools and laboratories throughout the US.
Although the Tensor was highly successful it later became challenged and eventually defeated by another popular rival lighting solution called the Lytegem, designed by Michael Lax and distributed by Lightolier.
American business schools later used the case study of the Tensor Corp to demonstrate that even with a great product, a company can flounder through poor management.
Via Flickr and Atomic Design.