![]() In addition to high levels of measurement uncertainty, the field of radiometry and photometry has been characterized by confusion of terminology, symbols, definitions and units. A light meter or a radiometric light measurement system must be designed to measure the distribution of energy over one parameter while holding all others constant. Light energy is distributed over wavelength, position, direction, time and polarization. Optical radiation is perhaps the most difficult form of energy to measure accurately. ![]() They offer o variety of modular light meters. 4 Ill lightmeters, optical radiometers and detectors International light Technol og ies (ILT) has been the most respected name in research oriented light measurement for 40 years.
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