Some manufacturers say indicator lights can sometimes serve a practical purpose. For example, an indicator light could show that a device is charging or plugged in and working properly. The light has a long lifespan and doesn’t generate excess heat — important qualities for a technology that’s used every day. “As a manufacturer, adding an LED light does cost something, so to add one just to add one seems quite wasteful. Linhares Jr. also said the lights can be helpful as night lights.

---

Persons: can’t, ” Steven Lockley, Paul Bogard’s, Kyle Moschen, Vincent van Gogh’s, Kyle Moschen “, Moschen, “, Jonathan King, ” King, —, Isamu Akasaki, Hiroshi Amano, Shuji Nakamura, ” David Loftus, ” Loftus, Manny Linhares Jr, Legrand, it’s, ”, Linhares, John Towfighi Organizations: Washington CNN, Harvard Medical School’s Division, Sleep, CNN, Logitech, Getty, Electronic Components Industry Association Locations: Seattle, New York, French