Light is electromagnetic radiation. What we see as visible light is only a tiny fraction of the electromagnetic spectrum, extending from very-low-frequency radio waves through microwaves, infrared, visible and ultraviolet light to x-rays and ultra energetic gamma rays. Our eyes respond to visible light; detecting the rest of the spectrum requires an arsenal of scientific instruments ranging from radio receivers to scintillation counters.
Radiometry is the science of measuring light in any portion of the electromagnetic spectrum. In practice, the term is usually limited to the measurement of infrared, visible, and ultraviolet light using optical instruments.
Meanwhile Photometry is the science of measuring visible light in units that are weighted according to the sensitivity of the human eye. It is a quantitative science based on a statistical model of the human visual response to light -- that is, our perception of light -- under carefully controlled conditions.
Radiometry is the science of measuring light in any portion of the electromagnetic spectrum. In practice, the term is usually limited to the measurement of infrared, visible, and ultraviolet light using optical instruments.
Meanwhile Photometry is the science of measuring visible light in units that are weighted according to the sensitivity of the human eye. It is a quantitative science based on a statistical model of the human visual response to light -- that is, our perception of light -- under carefully controlled conditions.
The following link give you an easy to understand reading material that describe the fundamental concepts used to quantify the light, i.e. which are categorized as the Radiometry and Photometry
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