Correlated color temperature: Use and limitations

Durmus, Dorukalp

doi:10.1177/14771535211034330

Cited by 61 publications

(48 citation statements)

References 66 publications

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“…D. Durms stated that there are limitations in the application of CCT in scientific research due to the loss of information caused by reducing the spectral power distribution of a light source to a one-dimensional metric. The absolute spectral data for the daylight was not directly measured in this study [ 34 ]. Its absolute spectral power distributions of light sources with radiometric quantities and Duv are not known and should be measured in future studies.…”

Section: Discussionmentioning

confidence: 99%

Investigating the Daytime Visibility Requirements of Pavement Marking Considering the Influence of CCT and Illuminance of Natural Light

Guan

Wang

et al. 2022

IJERPH

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Pavement marking in daylight with poor quality cannot provide a reference for drivers to specify their own position relative to nearby vehicles. Luminance and Correlated color temperature (CCT) of sunlight is of importance for daytime visibility of in-service pavement markings, which lacks detailed consideration. This paper aims to explore the daytime visibility requirements of in-service pavement markings considering the influence of natural light characteristics. Based on analyzing the mechanism and impact factors of daytime visibility of pavement markings, a subjective scale of pavement markings state in the drivers’ field of view was proposed and a short and bold line was recommended as the standard state. Thirty-six tested drivers were randomly selected to detect white and yellow markings of both 15 cm and 20 cm width under 2000 to 23,000 lx and 5500 to 8500 K for outdoor natural light environment. The luminance contrast of the pavement marking to the surrounding road surface ranged from 0 to 10. The result indicated that the natural light with 2000 to 3000 lx and 7500 to 8500 K is the most unfavorable light environment for drivers to recognize pavement markings during daytime. The detection distance is becoming longer with the increase of luminance contrast. The detection distance does not increase with the increase of luminance contrast when the luminance contrast of white markings is greater than 4 and that of yellow markings is greater than 3. The model was established expressing the relationship between luminance contrast and Qd contrast. The preview time 3.65 s was selected to calculate the minimum requirements of Qd at speeds of 60, 80, 100 km/h, respectively, for different types of markings. The results can provide scientific evidence for quality evaluation and maintenance management of pavement markings in service for daytime visibility.

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Section: Discussionmentioning

confidence: 99%

Investigating the Daytime Visibility Requirements of Pavement Marking Considering the Influence of CCT and Illuminance of Natural Light

Guan

Wang

et al. 2022

IJERPH

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“…This paper contributes to the ongoing research on the perception of the visual qualities of lighting and related areas (e.g. [27,49,57]). In addition, it responds to the need in the lighting and real estate industries for an established terminology to describe perceived light qualities.…”

Section: -1-3-measuring Perceived Light Qualitiesmentioning

confidence: 96%

“…While colour temperature can be physically measured, perceived light colour is what the human eye can observe, and there is no exact connection between these measures. Two light sources with the same correlated colour temperature can appear to be different with regard to light colour [27,28]. This may be due to physically measurable deviations from the light distribution from an ideal blackbody [29,30], to human perception [31,32], or to human eyesight being very sensitive to these colour differences [28,33], as is known from colour research [34,35].…”

Section: -1-2-physical and Visually Perceived Measures Of Light Quali...mentioning

confidence: 99%

User-Centric Measures of the Perceived Light Qualities of Lighting Products

Hiller

Boork²,

Enger³

et al. 2023

Emerg Sci J

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Nowadays, lighting planning is predominantly determined by the need to meet physically measurable requirements that are often based on current lighting standards. However, meeting the minimum technical requirements of the standards is no guarantee for a visually appealing light environment. Instead, requirements based on perceived light qualities also need to be included to achieve better user comfort. Taking perception-based qualities into consideration when creating a light environment is, for many, not an easy task. In addition, a common terminology for perceived light qualities is currently lacking, both in industry and in research. The aim of this paper is, therefore, to explore how perceived light qualities of white light sources can be described when employing user-centric measures. The focus was on the qualities of light colour and diffuse and distinct light since these qualities have a great impact on the visual impression of light. The perception was assessed by applying analytical sensory analysis to lighting products, a method found to be promising in previous work. The methodology is based on analytical measurement by the human senses, which is particularly valuable when developing a general terminology. Since sensory analysis is still quite new to the topic of lighting, the applicability of using the methodology to assess lighting in a real context was also investigated. The results of the studies showed that the perception of light qualities can be described using further concepts in addition to those currently used. For light colour, the concepts of reddish, bluish, yellowish, and greenish light colours proved suitable for providing a richer description of the quality. The concepts of diffuse and distinct light satisfactorily captured variations in light contrast produced by shadows, reflections, and sparkles. In addition, the studies revealed that analytical sensory analysis was applicable for assessing the perception of lighting in a real-world context. The latter means that knowledge gained in the laboratory can be translated into real environments. The user-centric measures investigated in this paper have contributed to the terminology related to perceived light qualities. These can complement the physical measures in lighting planning to promote light environments that are not only energy efficient and meet technical requirements, but also cater for increased user comfort. Doi: 10.28991/ESJ-2023-07-02-022 Full Text: PDF

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“…Light quality based on visual parameters such as chromaticity or color rendering affect significantly on user acceptability of lighting technologies, i.e., early compact fluorescent lamps suffered upon market introduction due to their poor color rendering and appearance [24]. LED phosphor-converted (PC) white light performance and its continuous development is improving in new packages, in a combined way and within a wide range of correlated color temperature (CCT), the Duv, and color rendering metrics, such as AN-SI/IES TM-30 or CRI Ra [25,26]. Nowadays, even cool white light is available with CRIs higher than 90 as red-light conversions are being improved using, for example, co-doped phosphor-in-glass (PiG) [27].…”

Section: Lightingmentioning

confidence: 99%

Autonomous Photovoltaic LED Urban Street Lighting: Technical, Economic, and Social Viability Analysis Based on a Case Study

Orejón-Sánchez¹,

Díaz²,

Calderón³

2021

Sustainability

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This paper analyzes the technical and economic viability and sustainability of urban street lighting installation projects using equipment powered by photovoltaic (PV) energy. First, a description of the state-of-the-art of the technology is performed, studying the components involved in solar LED luminaires for street lighting application and examples of autonomous PV systems installed in different countries. Later, a case study a based on a renovation project of the street lighting installation at a 5000-inhabitant municipality in Lanzarote (Spain) is presented. Two alternatives are analyzed: underground channeling of the previous aerial electrical grid and the installation of LED luminaires, and, on the other hand, the installation of autonomous LED solar luminaires. Simulations concluded that a PV lighting installation proposal guarantees the existing M3 lighting requirements (EN 13201-2:2015) and represents a saving in the material execution budget of 43.78% with respect to the channeled power grid option. Finally, a statistical study has been carried out to assess the social acceptance of Spanish citizens of this autonomous PV technology in urban environments. This considers strengths and weakness of the technology: sustainability, robustness, visual impact, or risk of vandalism. In general, most subjects of all age segments are aware of the problem that means having aerial wiring running at facades (95%) and considers the use of PV in urban lighting sustainable (88%). However, 47% of those surveyed consider that shutdowns due to lack of energy harvesting is problematic and 17% consider this very problematic. This major drawback (visual impact of PV equipment is mostly evaluated as neutral) gives rise to social reluctance, especially in people younger than 50 who remarked this as more problematic than senior segments. Thus, guaranteed operational service is fundamental to have social agreement for PV technology implementation.

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Correlated color temperature: Use and limitations

Cited by 61 publications

References 66 publications

Investigating the Daytime Visibility Requirements of Pavement Marking Considering the Influence of CCT and Illuminance of Natural Light

Investigating the Daytime Visibility Requirements of Pavement Marking Considering the Influence of CCT and Illuminance of Natural Light

User-Centric Measures of the Perceived Light Qualities of Lighting Products

Autonomous Photovoltaic LED Urban Street Lighting: Technical, Economic, and Social Viability Analysis Based on a Case Study

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