Effect of Correlated Color Temperature and S/P-ratio of LED Light Sources on Reaction Time in Off-axis Vision and Mesopic Lighting Levels

Vicente, EG; Matesanz, BM; Rodríguez‐Rosa, Miguel; Sáez, Ana Maroto; Mar, S.; Arranz, I.

doi:10.1080/15502724.2021.1970580

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Finally, the argument concerning the weight of the visual component in RT when using close-to-threshold contrasts justifies to a large extent the differences found with respect to the work of Vicente et al . 18 using LEDs. On the other hand, the increase in RT observed in the cataract group, in comparison to the baseline group, and the absence of lamp effect are explained by the above-mentioned changes in the light transmission produced by cataract.…”

Section: Discussionmentioning

confidence: 99%

“…The same spectrum effect on RT has also been obtained using LED light sources that differ in their spectra, with faster responses as the S/P ratio increases. 18 Currently, old people constitute a significant and growing percentage of drivers. 19,20 However, aging poses a number of problems recognized by older drivers, 20 which lead them to limit their activity.…”

Section: Introductionmentioning

confidence: 99%

“…The same spectrum effect on RT has also been obtained using LED light sources that differ in their spectra, with faster responses as the S/P ratio increases. 18…”

Section: Introductionmentioning

confidence: 99%

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Effect of the spectral power distribution on visual performance of subjects implanted with intraocular lenses with or without a blue light-filter under night-driving conditions

Vicente

Matesanz

Galarreta

et al. 2022

Lighting Research & Technology

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In old subjects, the effect on visual performance of the interaction between the spectral power distribution of street lamps and the different types of intraocular lenses (IOLs) is unknown. Contrast threshold (CT) and reaction time (RT) were analysed in off-axis vision at mesopic illumination conditions provided by high-pressure sodium and metal-halide lamps, using a Maxwellian view optical system. Four groups of subjects participated: 10 young subjects, 20 elderly subjects with cataracts and the same subjects after cataract surgery were divided into two groups, 10 subjects implanted with a blue light-filtering and 10 subjects with a non-blue light-filtering IOL (NBIOL). Age-related cataract impairs detection and reaction capabilities; tasks that are nevertheless improved after surgery. The type of lamp does not affect both tasks in the case of the blue light-filtering IOL group, but it does in the NBIOL group. When comparing the two lenses, no detrimental effect of the blue light filter is observed in both tasks. In conclusion, at representative night-driving conditions, the spectral power distribution of the street lamp does not have a clinically relevant effect on visual tasks such as CT and visual RT in pseudophakic subjects, regardless of the type of IOL implanted.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the spectral power distribution on visual performance of subjects implanted with intraocular lenses with or without a blue light-filter under night-driving conditions

Vicente

Matesanz

Galarreta

et al. 2022

Lighting Research & Technology

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“…The release of electrons in the metal causes an electric current that can be read when connected to a simple circuit [10]. The variable distance between the light source and the metal is inversely related [11,12]. If the wavelength of light travels across the metal by changing the variable distance, the greater the distance, the smaller the electric current.…”

Section: Introductionmentioning

confidence: 99%

The Correlation Between Electric Current Produced and the Light Source Distance in Photoelectric Effect Experiments

Fitri

Budi

Nasbey

et al. 2023

SPEKTRA

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In experimental observations of the relationship between the electric current generated and the distance of the light source on the Planck constant device, it can show a comparison between the electric current generated and the variable distance of the light source. The experimental equipment specifications use the Planck constant experimental set with a 12v/35w tungsten halogen lamp, output 15v, accuracy +-0.2%, power requirement 220V, fuse rating 0.5A and red filter. Experiments using the concept of the photoelectric effect phenomenon begin by irradiating metal materials with constant photon light and then the light passes through a red light filter with a wavelength of 635 nm. The use of a filter is done by placing a 635 nm light filter on the light propagation path to the metal material, so that the light that passes through the filter is only light with a wavelength of 635 nm. The choice of the red filter is due to the fact that the frequency of light with a wavelength of 635 nm can cause electrons to come out of the metal as a result of photons hitting electrons in the metal. After the metal material is irradiated with photon light, the electron charges on the metal will be disturbed and come out of the metal. The movement of these electrons produces an electric current whose value can be seen. By testing distances of 18, 20, 22, 24, 26, 28, and 30 cm, the results of a current value of 0.528 are obtained; 0.382; 0.295; 0.232; 0.182 and 0.154. From these experiments it was shown that the further away the light source, the smaller the electric current generated due to the light. This is because the closer the distance to the light source, the more light intensity hitting the metal, this results in a greater number of photons hitting the metal.

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Adaptive correlated color temperature control of LEDs considering ambient sound variations as a novel strategy to meet the requirements of inhabitants of smart cities

Kalani

2022

Optik

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Effect of Correlated Color Temperature and S/P-ratio of LED Light Sources on Reaction Time in Off-axis Vision and Mesopic Lighting Levels

Cited by 5 publications

References 38 publications

Effect of the spectral power distribution on visual performance of subjects implanted with intraocular lenses with or without a blue light-filter under night-driving conditions

Effect of the spectral power distribution on visual performance of subjects implanted with intraocular lenses with or without a blue light-filter under night-driving conditions

The Correlation Between Electric Current Produced and the Light Source Distance in Photoelectric Effect Experiments

Adaptive correlated color temperature control of LEDs considering ambient sound variations as a novel strategy to meet the requirements of inhabitants of smart cities

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