radiometry

thumb|upright=1.5|Comparison of photometric and radiometric quantities Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light. Radiometric techniques in optics characterize the distribution of the radiation's power in space, as opposed to photometric techniques, which characterize the light's interaction with the human eye.

The fundamental difference between radiometry and photometry is that radiometry can cover the entire optical radiation spectrum, while photometry is limited to the visible spectrum. However, some definitions of radiometry include other portions of the electromagnetic radiation spectrum, and some glossaries define photometry such that associated quantities are weighted by wavelength according to the spectral sensitivity of the human visual system. Photometry can therefore be considered a kind of radiometry. Radiometry is distinct from quantum techniques such as photon counting.