More information: Yunyi Zhu et al, PortaChrome: A Portable Contact Light Source for Integrated Re-Programmable Multi-Color ...
Lasers, LEDs and light sources are devices that create light. LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors.
Reacting to the LED "turning point," color technology and science firm X-Rite has debuted the Judge LED light booth.