For such measurements, goniophotometers (from the Greek “gonia,” an angle; “photos,” light; and “metron,” measure) have been used by traditional lighting manufacturers for some time. For the most part ...

A nanocandela (ncd) is a unit of luminous intensity in the International System of Units (SI), equivalent to one billionth of a candela (cd). The candela measures the light emitted by a source in a ...

Various optical systems or geometries can be used to perform light measurements. For instance, the total power [flux] of a light source can be measured in all directions, in a specific direction or ...

Photometric measurements bias the radiant power at each wavelength with a luminosity function, which models human spectral sensitivity, to account for this variation. The photopic sensitivity function ...

In my last installment, I discussed some of the science behind how the human eye actually perceives light—important to know as we continue to strive to deliver to the viewer the highest fidelity ...