This chapter discusses light measurement. Conversions between different integrated measurements such as lux and photosynthetically active radiation (PAR) can be done if one knows the spectrum of the light. However, in most cases, if one knows the spectrum, there is no need to take integrated measurements, since one can easily integrate the data later. Indeed, although they cannot convert radiance to irradiance, spectra are a central clearinghouse that can be converted into almost every other light measurement. In fact, the benefits of spectral measurements so far outweigh the costs that the best purchase for anyone measuring light is a spectroradiometer. The chapter then explores the use of spectrometers in light measurement, beginning with equipment issues and then going on to specific applications.
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