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 ...

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 ...

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 ...

Always on the lookout for better ways to measure all kinds of things, researchers have published a detailed study suggesting an "elegant" improved definition for the standard unit of light power, the ...