VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Bulb research. Prototype low heat light bulb being tested within a miniature Ulbricht, or integrating, sphere. Once closed, the sphere's reflective inner surface allows the intensity of the bulb to be found using a sensor. Photographed at Siemens' Osram Sylvania Laboratory in Beverly, Massachusetts, USA.
Model release not required. Property release not required.