Role of Architectural Design in Creating Circadian-Effective Interior Settings

Alkhatatbeh, Baraa J.; Asadi, Somayeh

doi:10.3390/en14206731

Cited by 10 publications

(4 citation statements)

References 114 publications

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“…Circadian entrainment, which plays a crucial role in regulating human biological rhythms, relies on the precise control of lighting conditions to mimic natural daylight [45][46][47][48][49]. The research findings suggest that curve fitting can contribute to accurate lighting systems for circadian entrainment, potentially benefiting applications in healthcare facilities, workplaces, and residential settings where maintaining a healthy daily rhythm is essential.…”

Section: Discussionmentioning

confidence: 97%

Curve-Fitting Correction Method for the Nonlinear Dimming Response of Tunable SSL Devices

Kore,

Durmus

2023

Technologies

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Solid-state lighting (SSL) devices are ubiquitous in several markets, including architectural, automotive, healthcare, heritage conservation, and entertainment lighting. Fine control of the LED light output is crucial for applications where spectral precision is required, but dimming LEDs can cause a nonlinear response in its output, shifting the chromaticity. The nonlinear response of a multi-color LEDs can be corrected by curve-fitting the measured data to input dimming controls. In this study, the spectral output of an RGB LED projector was corrected using polynomial curve fitting. The accuracy of four different measurement methods was compared in order to find the optimal correction approach in terms of the time and effort needed to perform measurements. The results suggest that the curve fitting of very high-resolution dimming steps (n = 125) significantly decreased the chromaticity shifts between measured (actual) and corrected spectra. The effect size between approaches indicates that the curve-fitting of the high-resolution approach (n = 23) performs equally well as at very high resolution (n = 125). The curve-fitting correction can be used as an alternative approach or in addition to existing methods, such as the closed-loop correction. The curve fitting method can be applied to any tunable multi-color LED lighting system to correct the nonlinear dimming response.

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Section: Discussionmentioning

confidence: 97%

Curve-Fitting Correction Method for the Nonlinear Dimming Response of Tunable SSL Devices

Kore,

Durmus

2023

Technologies

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“…If the SPD is readily available for the calculation of CCT, mel-DER can be computed with a few additional computations. (Note that relative to calculations of mel-DER using a light source’s SPD, field measurements of mel-DER will likely differ due to attenuation of short wavelengths by room surfaces 43 – 49 ; preliminary evidence suggests that field measurements of mel-DER are likely to be lower than estimates with a light source’s SPD 48 – 50 , especially where non-white, non-blue surfaces are present 51 ).…”

Section: Discussionmentioning

confidence: 99%

Correlated color temperature is not a suitable proxy for the biological potency of light

Esposito

Houser

2022

Sci Rep

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Using a simulation based on a real, five-channel tunable LED lighting system, we show that Correlated Color Temperature (CCT) is not a reasonable predictor of the biological potency of light, whether characterized with CIE melanopic Equivalent Daylight Illuminance (mel-EDI), Equivalent Melanopic Lux (EML) (a scalar multiple of mel-EDI), or Circadian Stimulus (CS). At a photopic corneal illuminance of 300 lx and Rf ≥ 70, spectra can vary in CS from 17 to 41% across CCTs from 2500 to 6000 K, and up to 23% at a single CCT, due to the choice of spectrum alone. The CS range is largest, and notably discontinuous, at a CCT of 3500 K, the location of the inflection point of the CS model. At a photopic corneal illuminance of 300 lx and Rf ≥ 70, mel-EDI can vary from 123 to 354 lx across CCTs from 2500 to 6000 K and can vary by up to 123 lx at a fixed CCT (e.g., 196 to 319 lx at 5000 K). The range of achievable mel-EDI increases as CCT increases and, on average, decreases as color fidelity, characterized with IES TM-30 Rf, increases. These data demonstrate that there is no easy mathematical conversion between CS and mel-EDI when a spectrally diverse spectra set of spectral power distributions is considered.

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“…Additionally, seating direction and space allocation affect the amount of vertical light received by the human eye and the amount of EML as a result [38]. There are many other architectural design elements that affect access to daylight in interior spaces, such as the number, size, and location of windows, room depth, shading devices and external obstructions, glazing properties, and so forth [39]. However, the lack of daylight in spaces should be supplemented with electric lighting.…”

Section: Interior Design Elementsmentioning

confidence: 99%

Human-Centric Lighting Design: A Framework for Supporting Healthy Circadian Rhythm Grounded in Established Knowledge in Interior Spaces

Jalali,

Jones,

Tural

et al. 2024

Buildings

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Over the past 300 years, scientific observations have revealed the significant influence of circadian rhythms on various human functions, including sleep, digestion, and immune system regulation. Access to natural daylight is crucial for maintaining these rhythms, but modern lifestyles often limit its availability. Despite its importance, there is a lack of a comprehensive design framework to assist designers. This study proposes an architectural design framework based on the review of literature, lighting-related codes and standards, and available design and analysis tools that guides the creation of lighting systems supporting healthy circadian rhythms. The framework outlines key decision-making stages, incorporates relevant knowledge, and promotes the integration of dynamic lighting techniques into building design. The proposed framework was presented to a group of design professionals as a focus group and their feedback on the relevance and usability of the tool was obtained through a survey (n = 10). By empowering designers with practical tools and processes, this research bridges the gap between scientific understanding and design implementation, ensuring informed decisions that positively impact human health. This research contributes to the ongoing pursuit of creating lighting environments that support healthy circadian rhythms and promote human well-being.

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Role of Architectural Design in Creating Circadian-Effective Interior Settings

Cited by 10 publications

References 114 publications

Curve-Fitting Correction Method for the Nonlinear Dimming Response of Tunable SSL Devices

Curve-Fitting Correction Method for the Nonlinear Dimming Response of Tunable SSL Devices

Correlated color temperature is not a suitable proxy for the biological potency of light

Human-Centric Lighting Design: A Framework for Supporting Healthy Circadian Rhythm Grounded in Established Knowledge in Interior Spaces

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