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Shih, K.-T.; Liu, J.-S.; Shyu, F.; Yeh, S.-L.; Chen, H.H. |
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Title |
Blocking harmful blue light while preserving image color appearance |
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Journal Article |
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Year |
2016 |
Publication  |
ACM Transactions on Graphics |
Abbreviated Journal |
Tog |
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Volume |
35 |
Issue |
6 |
Pages |
1-10 |
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Keywords |
Lighting; Vision |
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Abstract |
Recent study in vision science has shown that blue light in a certain frequency band affects human circadian rhythm and impairs our health. Although applying a light blocker to an image display can block the harmful blue light, it inevitably makes an image look like an aged photo. In this paper, we show that it is possible to reduce harmful blue light while preserving the blue appearance of an image. Moreover, we optimize the spectral transmittance profile of blue light blocker based on psychophysical data and develop a color compensation algorithm to minimize color distortion. A prototype using notch filters is built as a proof of concept. |
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0730-0301 |
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LoNNe @ kyba @ |
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1640 |
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Brainard, G.C.; Coyle, W.; Ayers, M.; Kemp, J.; Warfield, B.; Maida, J.; Bowen, C.; Bernecker, C.; Lockley, S.W.; Hanifin, J.P. |
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Title |
Solid-state lighting for the International Space Station: Tests of visual performance and melatonin regulation |
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Journal Article |
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Year |
2013 |
Publication |
Acta Astronautica |
Abbreviated Journal |
Acta Astronautica |
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92 |
Issue |
1 |
Pages |
21-28 |
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Keywords |
Human Health; Lighting |
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The International Space Station (ISS) uses General Luminaire Assemblies (GLAs) that house fluorescent lamps for illuminating the astronauts' working and living environments. Solid-state light emitting diodes (LEDs) are attractive candidates for replacing the GLAs on the ISS. The advantages of LEDs over conventional fluorescent light sources include lower up-mass, power consumption and heat generation, as well as fewer toxic materials, greater resistance to damage and long lamp life. A prototype Solid-State Lighting Assembly (SSLA) was developed and successfully installed on the ISS. The broad aim of the ongoing work is to test light emitted by prototype SSLAs for supporting astronaut vision and assessing neuroendocrine, circadian, neurobehavioral and sleep effects. Three completed ground-based studies are presented here including experiments on visual performance, color discrimination, and acute plasma melatonin suppression in cohorts of healthy, human subjects under different SSLA light exposure conditions within a high-fidelity replica of the ISS Crew Quarters (CQ). All visual tests were done under indirect daylight at 201 lx, fluorescent room light at 531 lx and 4870 K SSLA light in the CQ at 1266 lx. Visual performance was assessed with numerical verification tests (NVT). NVT data show that there are no significant differences in score (F=0.73, p=0.48) or time (F=0.14, p=0.87) for subjects performing five contrast tests (10%–100%). Color discrimination was assessed with Farnsworth-Munsell 100 Hue tests (FM-100). The FM-100 data showed no significant differences (F=0.01, p=0.99) in color discrimination for indirect daylight, fluorescent room light and 4870 K SSLA light in the CQ. Plasma melatonin suppression data show that there are significant differences (F=29.61, p<0.0001) across the percent change scores of plasma melatonin for five corneal irradiances, ranging from 0 to 405 μW/cm2 of 4870 K SSLA light in the CQ (0–1270 lx). Risk factors for the health and safety of astronauts include disturbed circadian rhythms and altered sleep–wake patterns. These studies will help determine if SSLA lighting can be used both to support astronaut vision and serve as an in-flight countermeasure for circadian desynchrony, sleep disruption and cognitive performance deficits on the ISS. |
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0094-5765 |
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LoNNe @ kyba @ |
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1533 |
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Boldogh, S.; Dobrosi, D.; Samu, P. |
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The effects of the illumination of buildings on house-dwelling bats and its conservation consequences |
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2007 |
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Acta Chiropterologica |
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Acta Chiropterologica |
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9 |
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2 |
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527-534 |
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Animals |
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1508-1109 |
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LoNNe @ kagoburian @ |
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1003 |
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Petrželková, K. J.; Downs, N. C.; Zukal, J.; Racey, P. A. |
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A comparison between emergence and return activity in pipistrelle bats Pipistrellus pipistrellus and P. pygmaeus |
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Journal Article |
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2006 |
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Acta Chiropterologica |
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8 |
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2 |
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381-390 |
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animals; fying mammals: animal behaviour |
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Bats may be vulnerable to predation during evening emergence and morning return to their roosts. Early emergence increases the risk of exposure to raptorial birds, but emerging late confers a risk of missing the dusk peak of aerial insects. Here, both emergence and return activity was studied in detail at the same roosts for the first time. We investigated six maternity colonies of pipistrelle bats (Pipistrellus pipistrellus and P. pygmaeus) in NE Scotland and recorded light levels and time of emergence and return of the bats with respect to sunset and sunrise on the same nights. Parameters of return activity generally occurred at lower light intensities than those of emergence. Therefore, the interval between dawn return and sunrise was generally longer than that between sunset and dusk emergence. Emergence and return were equal in duration. Bats clustered more on emergence in comparison with return during pregnancy and lactation, whereas during postlactation this trend was reversed. |
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BioOne |
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English |
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LoNNe @ schroer @ |
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1598 |
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Author |
Sardo, G.; Okpala, C.; Geraci, M.; Fiorentino, F.; Vitale, S. |
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Title |
The effects of different artificial light wavelengths on some behavioural features of juvenile pelagic Atlantic horse mackerel, Trachurus trachurus (Actinopterygii: Perciformes: Carangidae) |
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Journal Article |
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Year |
2020 |
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Acta Ichthyologica et Piscatoria |
Abbreviated Journal |
Acta Ichthyol. Piscat. |
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50 |
Issue |
1 |
Pages |
85-92 |
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Animals; trawl fishery; horse mackerel,; artificial light; attraction; repulsion; Trachurus trachurus |
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Background. Atlantic horse mackerel, Trachurus trachurus (Linnaeus, 1758), is among bento-pelagic species subject to discard within deep-water rose shrimp fisheries, and how such species would react to light wavelength is therefore important, to be consistent with the Common Fishery Policy (CFP). Despite the existing literature currently available, there is still paucity of relevant information about how artificial light wavelengths affects the behaviour of T. trachurus juveniles. In this context, the effects of different artificial light wavelengths on some behavioural features of juvenile T. trachurus were investigated.
Materials and methods. Maintained in a fish tank, the juveniles of Atlantic horse mackerel, after acclimatization, were subject to six different light wavelengths, representing the following colours: white, violet, blue, green, yellow, and red. Subsequently, behavioural features, specifically phototaxis (degree of attraction or repulsion toward the light source) were tested.
Results. By phototaxis per light wavelength, the studied juvenile individuals produced statistical differences in the presence frequency (P < 0.05) revealed by blue that noticeably attracted some, relative to the white light that repulsed others. Yet, violet and red lights produced much less but no significant attraction of these juveniles (P > 0.05).
Conclusion. The presently reported study has provided additional information about ecological knowledge and understanding specific to juvenile T. trachurus individuals, which can further the development of (selective) light fishing techniques, aimed at reducing unwanted catches of commercial pelagic fisheries. |
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1 Istituto per le Risorse Biologiche e le Biotecnologie Marine, Consiglio Nazionale delle Ricerche, Mazara del Vallo, Italy; giacomo.sardo ( at ) irbim.cnr.it |
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The West Pomeranian University of Technology in Szczecin |
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English |
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English |
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0137-1592 |
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IDA @ john @ |
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3407 |
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