Simulation and comparison of the illuminance, uniformity, and efficiency of different forms of lighting used in basketball court illumination

Sun, Wen Shing; Tien, Chuen‐Lin; Tsuei, Chih Hsuan; Pan, Jui Wen

doi:10.1364/ao.53.00h186

Cited by 9 publications

(8 citation statements)

References 12 publications

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“… 40 The glare phenomenon has great importance in basketball, and players are constantly exposed to glare due to illumination conditions in basketball courts. 41 The differences found between basketball players and sedentary individuals could be explained from the perspective that abilities involved during the game are inherently developed while playing the sport (e.g., higher tolerance), 6 as occurs with the better selective attention demonstrated in international basketball players. 42 …”

Section: Discussionmentioning

confidence: 99%

Visual function, performance, and processing of basketball players vs. sedentary individuals

Vera

Jiménez

Vélez

et al. 2020

Journal of Sport and Health Science

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Background Athletes tend to have better visuo-motor performance than do sedentary individuals. However, several basic visual-function and perceptual parameters remain unexplored to date. In this study, we investigated whether differences exist in visual function, performance, and processing between basketball players and individuals without a sport-involvement background. Methods A total of 33 healthy men with no visual impairment or pathology were divided into 2 groups, depending on the involvement in sport (semi-professional basketball players and sedentary individuals). We tested their baseline heart-rate variability in the resting position apart from subjective questionnaires to determine their physical fitness level, and we checked their visual function, performance, and processing through an extended battery of optometric tests. Results The 2 groups differed in resting heart-rate variability parameters ( p < 0.001), confirming their dissimilarities in regular time practising sports per week. The basketball players showed a closer breakpoint and recovery nearpoint of convergence, a higher fusional-vergence rate, better discriminability halos, and better eye–hand coordination (all p values < 0.05). Conclusion These results show evidence that athletes, basketball players in this case, exhibit better performance in several visual abilities in comparison to a group of individuals without sporting backgrounds, suggesting an improvement due to the systematic involvement of those skills during basketball practice.

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Section: Discussionmentioning

confidence: 99%

Visual function, performance, and processing of basketball players vs. sedentary individuals

Vera

Jiménez

Vélez

et al. 2020

Journal of Sport and Health Science

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“…Illuminance attenuation dispersion rate is the ratio of standard deviation and the mean value of d 50 or d 10 , which reflects illuminance uniformity. 13 Experimental results suggested that light unevenness was present due to the inconsistency in the illuminance attenuation rate at the measurement points, especially after being blocked by two masks. A previous study has shown that both changing light field sizes and shapes and casting shadows and slight colour variations in LED luminaires are not covered by the current standard.…”

Section: Discussionmentioning

confidence: 97%

Illuminance uniformity in obstructed LED surgical lighting

Zhou

Ding

Qin

et al. 2022

Lighting Research & Technology

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Uniform illumination is key to surgery. According to the standard, the illuminance uniformity is measured with no obstruction, which cannot fully reflect the performance in the working environment. This study aimed to measure the illuminance uniformity with obstruction. Besides, the illuminance attenuation dispersion rate was introduced. The illuminance uniformity test was set up under the IEC Standard, and five different types of luminaires were measured. The appropriate sizes of the light spots were chosen first. Subsequently, the light sources with light field diameters d50 and d10 with or without obstacles were measured, and the illuminance attenuation dispersion rate was calculated. The experimental results showed that the d50/d10 ratio did not appear to be affected by obstructions. There appeared visible deformation of the light spot shape in some products. As we assumed, there were significant differences in the illuminance attenuation dispersion rate among these products. Although d50/d10 ratio did not seem to be affected by the obstructions, the shape of the light spot deformed. The illuminance attenuation dispersion rate may be a key parameter to judge the LED surgical lighting.

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“…Six plants per species were assigned to the high light (HL) treatment of 1800 µmol m - 2 s - 1 (measured irradiance average: 1843.6 µmol m - 2 s - 1 ) and the remaining six to the low light (LL) treatment of 200 µmol m - 2 s - 1 (measured irradiance average: 227.5 µmol m - 2 s - 1 ). Ir-radiance uniformity was very high for both HL and LL treatments, with a U 2 value (defined as minimum ir-radiance/maximum irradiance , [25, 26]) of 0.93. Plant positions were randomised across growing areas.…”

Section: Methodsmentioning

confidence: 99%

Comparative transcriptomics of Hirschfeldia incana and relatives highlights differences in photosynthetic pathways

Garassino,

Luoni,

Cumerlato

et al. 2023

Preprint

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Photosynthesis is the only yield-related trait that has not yet been substantially improved by plant breeding. The limited results of previous attempts to increase yield via improvement of photosynthetic pathways suggest that more knowledge is still needed to achieve this goal. To learn more about the genetic and physiological basis of high photosynthetic light-use efficiency (LUE) at high irradiance, we studyHirschfeldia incana. Here, we compare the transcriptomic response to high light ofH. incanawith that of three other members of the Brassicaceae,Arabidopsis thaliana,Brassica rapa, andBrassica nigra, which have a lower photosynthetic LUE. First, we built a high-light, high-uniformity growing environment in a climate-controlled room. Plants grown in this system developed normally and showed no signs of stress during the whole growth period. Then we compared gene expression in low and high-light conditions across the four species, utilizing a panproteome to group homologous proteins efficiently. As expected, all species actively regulate genes related to the photosynthetic process. An in-depth analysis on the expression of genes involved in three key photosynthetic pathways revealed a general trend of lower gene expression in high-light conditions. However,H. incanadistinguishes itself from the other species through higher expression of certain genes in these pathways, either through constitutive higher expression, as forLHCB8, ordinary differential expression, as forPSBE, or cumulative higher expression obtained by simultaneous expression of multiple gene copies, as seen forLHCA6. These differentially expressed genes in photosynthetic pathways are interesting leads to further investigate the exact relationship between gene expression, protein abundance and turnover, and ultimately the LUE phenotype. In addition, we can also exclude thousands of genes from "explaining" the phenotype, because they do not show differential expression between both light conditions. Finally, we deliver a transcriptomic resource of plant species fully grown under, rather than briefly exposed to, a very high irradiance, supporting efforts to develop highly efficient photosynthesis in crop plants.

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Simulation and comparison of the illuminance, uniformity, and efficiency of different forms of lighting used in basketball court illumination

Cited by 9 publications

References 12 publications

Visual function, performance, and processing of basketball players vs. sedentary individuals

Visual function, performance, and processing of basketball players vs. sedentary individuals

Illuminance uniformity in obstructed LED surgical lighting

Comparative transcriptomics of Hirschfeldia incana and relatives highlights differences in photosynthetic pathways

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