Radiation

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Radiation
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longwave and shortwave radiation
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Lamberts Cosine Law
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For photosynthesis and photomorphogenesis
work radiation is measured in photometric units
(quantum flux density) mmol m-2 s-1 usually,
only the visible, or photosynthetically active
part of the spectrum is important in this case
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PPFD photosynthetically active photon flux
density PAR photosynthetically active
radiation (400-700 nm)
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For energy balance studies, radiation is
measured in radiometric units, for
example Watts m-2
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It is not easy to convert precisely from
photometric to radiometric units because photons
at different wavelengths have different
energies E hn hc/l
wavelength
Speed of light
frequency
Plancks constant
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