The Evolution Of Electric Light Bulbs
Imaged with the X-rays of Nikon's XTH225 CT system (left: Edison style incandescent light bulb, center: fluorescent light bulb, right: LED light bulb). In 2014, the invention of efficient blue light-emitting diodes (LEDs) was awarded the Nobel Prize in Physics. Subsequently, the United Nations declared the year of 2015 the International Year of Light and Light-based Technologies. [Taken from the Third Place 2015 After Image photo contest.]
—Herminoso Villarraga-Gómez Nikon Metrology Americas & University of North Carolina at Charlotte U.S.A.