Photometry
Photometry is the science of measuring visible light in units that are weighted according to the sensitivity of the human eye.
The sensitivity of the human eye to light varies with wavelength. A light source with a a given radiance of green light, for example, appears much brighter than the same source with the same radiance of red or blue light. To convert radiometric and photometric units, the eye's response is approximated by the CIE weighting function.
Photometric theory does not address how we perceive colors. The light being measured can be monochromatic or a combination or continuum of wavelengths.
Radiometry
the science of quantifying the phenomena of electromagnetic radiation.
In our context, we are interested in light, the limited range of electromagnetic radiation that is visible to the human eye, sometimes extended to the areas of infrared and ultraviolet. We also don't care about the quantum mechanical aspects of radiation. It will be enough to measure the physiologically perceiveable effects. For that purpose, we will often resort to the related field of photometry.
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