Results of studies to measure the potential effects of light spectra on human performance
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Results of studies to measure the potential effects of light spectra on human performance by A. Blair Irvine

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Published .
Written in English


  • Fluorescent lighting -- Physiological effect,
  • Exercise -- Physiological aspects

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Edition Notes

Statementby A. Blair Irvine.
The Physical Object
Paginationvii, 42, [78] leaves.
Number of Pages78
ID Numbers
Open LibraryOL13596256M

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  Continuous changes in cell concentration, growth rate, light penetration and also nutrient concentration over time during batch cultures make it difficult to independently measure the growth and productivity of microalgae under different light spectra. Therefore, in this study, we looked into the effects of different light spectra on Cited by: Experiment 1 (Lab period 1) Spectrophotometry: Absorption spectra and the use of light absorption to measure concentration Spectrophotometry is a procedure that File Size: 19KB.   Results. We located 56 studies containing 93 measurements (19 behavioural & 74 using ERG) of CFF mean for 81 species from 66 genera and 9 classes (Table 3, Table S1).We found a considerable range in CFF mean values amongst species, with the lowest value of Hz being obtained for the cane toad (Bufo marinus), and the highest value of Hz for the black fire beetle .   Rose plants were grown under different light spectra (monochromatic red, monochromatic blue, % red:blue or white) and were then exposed to high light ( μmol photons m −2 s −1) for 12 h. Roses grew well under monochromatic light (red and blue) but were more sensitive to subsequent high light stress than plants grown under.

  Light also conveys a powerful stimulating signal for human alertness and cognition and has been routinely employed to improve performance, counter the .   posed to a light setting inside a domestic, architectural, urban, commercial, working, or exhibition space (e.g. a museum or art gallery), but also into the natural environment (Kaplan & Kaplan, ), largely determined by human neuronal asset and psychophysical equipment, is one of the most evident, although effects of the light. The studies of Johkan et al. () found no major differences in the LA of young tomato plants using various spectra when they used a PPF of µmolm −2 s −1, whereas we recorded a considerable spectral effect in T1 vs. T0 (with the exception of tomato in treatment L). This may be due to the closer spectral fit between and nm.   The quantization is either due to direct emission from the plasma or by the phosphors, but to a human eye, the light emitted still seems white. Like incandescent bulbs, fluorescent bulbs can be inefficient because the plasma needs to be sustained and it emits radiation in the nonvisible range.

The present study investigates the effects of aging on non-visual spectral sensitivity to light and tests the hypothesis that circadian disturbances are related to a decreased light transmittance. In a within-subject design, eight aged and five young subjects were exposed at night to 60 minute monochromatic light stimulations at 9 different.   5G will employ low- ( GHz - GHz), mid- ( – 24 GHz), and high-band frequencies (24 GHz and higher). In the U.S., the Federal Communications Commission (FCC) has allocated “low-band” spectrum at GHz (e.g., MHz), “ mid-band” spectrum in the GHz range, and 11 GHz of “high-band” frequencies including licensed spectrum from GHz and GHz, as well as. ). These studies were used to examine how organizational learning helps employees attain performance results that enable them to accomplish their personal goals and objectives. For example, Sadler-Smith, Spicer, & Chaston () stated that organizational learning as the development or acquisition of new knowledge or skills in response to.   A new study shows changing lighting can have an effect on human behavior. Two different schools had half of their classrooms fitted with new lighting designed to be more similar to sunlight. Although this lighting was the same brightness as that in the classrooms with traditional lighting, it was designed to have both blue and white colored wavelengths.