In many industries LEDs are replacing traditional broadband light sources such as mercury, deuterium, Xenon, and quartz-halogen lamps. Systems and applications transitioning to LEDs are reengineered in terms of optics, electronics, heat management and more. Similarly, the equipment used by professionals to measure the output of these sources needs to be fitted for measuring LEDs.
Traditionally, broadband sources are measured using radiometers or photometers. These sensors have a relatively wide and uneven response over a certain spectral range such as UVA, UVB, UVC, etc. The sensor gives an integral of the measured spectral power density weighted by its own spectral response.