action spectrum


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Noun1.action spectrum - the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation
spectrum - an ordered array of the components of an emission or wave
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The action spectrum for bacteria is commonly reported as 265-267 nm peak wavelength, although wavelength susceptibility may vary among the large number of bacterial and viral strains.
The International Commission on Illumination (CIE) spectral damage function (SDF), which provides a way to characterize the potential of a light source to damage materials and includes a coefficient to tailor the action spectrum to various types of materials, illustrates that LED products carry no greater risk than do other sources of the same CCT.
3] doses (SVDs) relative to the horizontal plane using action spectrum conversion factors (ASCFs; Pope et al.
Advantages for plant researchers over existing T12 and T5 fluorescent systems include energy savings up to 70 and 50 percent, respectively, greater average PPF tailored to the photosynthetic action spectrum, improved horizontal and vertical light uniformity, a dimmable ballast to adjust PPF output to 50 percent of maximum without uniformity or spectral degradation, and a 30,000-hour rated lamp life.
This peak wavelength corresponds to the peak of photosynthetic action spectrum of plants (McCree, 1972).
Typically, for 50 to 75% of the hours of operation the BioLume[TM] will be operating within the amber part of the spectrum at a greatly reduced intensity, away from the critical action spectrum in terms of hormonal response for humans and other mammals, reptiles, and birds.
In approximately 50% of those affected, the action spectrum is actually UVA rays(3).
Given that "the action spectrum of pre vitamin D photosynthesis and that of squamous cell carcinoma are similar, one should expect to find a vitamin D gradient," they wrote.
5,6) Taking into account the solar spectrum and the action spectrum of the skin (erythema curve) yields the weighted UV radiation penetration or the UV protection factor (UPF).
In addition, large errors can occur due to out-of-band, non-linear, and non-ideal geometric or spatial response of the UV meters, Finally, in many applications, how well the response of the UV meter approximates the presumed action spectrum needs to be understood for optimal use of the meters.

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