Spectral reflectance and chromaticity differences of various colors of interior finishing material samples under tunable LED lamps

Ajrina, Zhafirah; Revantino,; Mangkuto, Rizki A.; Suprijanto,; Soelami, F.X. Nugroho

doi:10.1016/j.jobe.2021.103280

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…The more similar the SPD of a light source is to the natural light, the higher CRI it obtains, and the reverse is also true [37]. Though, both CRI and CCT are related to the spectral structure, they are two independent parameters to describe the optical performance of a light source [38]. The LED systems studied are realized by combination of PC white LEDs and monochrome red/green LEDs.…”

Section: The Mixed Cri and Discussion Of Improvementmentioning

confidence: 99%

Analysis and Tunable Models for Phosphor-Converted White Light-Emitting Diode Based on Spectral Compensation

et al. 2023

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The correlated color temperature (CCT) and color rendering index (CRI) are two significant indicators related to the color appearance and visual effects of illumination. This paper concentrates on dynamic dimming for phosphor-converted (PC) white LEDs to achieve tunable CCT and adequate CRI, via compensation of red/green spectra. The LED systems described have a simple configuration consisting of a PC white LED, a monochrome green LED and a monochrome red LED, which can be individually driven. Compared to individual PC white LEDs, both the spectral continuity and uniformity of the mixed white light are enhanced. The tunable dimming models are proposed by combination of spectral colorimetry and photo-electro-thermal (PET) theory, thus multi-physics effects are involved. From the modeling process and results, the nonlinear characteristics are observed. Experimental verifications present good agreement existing between calculations and measurements, both in terms of values and variation trends. These proposed models could be effective tools to figure out photometric characteristics and visual perception of illumination. On the other hand, they could provide schemes of reference to improve the illumination environment adapting to various special occasions and personal preferences.

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Section: The Mixed Cri and Discussion Of Improvementmentioning

confidence: 99%

Analysis and Tunable Models for Phosphor-Converted White Light-Emitting Diode Based on Spectral Compensation

et al. 2023

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“…In the actual measurement, it is difficult for ψ(λ) to be expressed in an accurate form. Therefore, in actual calculation, it is usually considered to be replaced by a summation method with equations (2) and (3) [39,40].…”

Section: Calculation Process Of the Munsell Valuementioning

confidence: 99%

Evaluation of asphalt ageing degree based on asphalt color

Wang

et al. 2023

Eng. Res. Express

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To understand the relationship between the surface color and ageing of asphalt, the evaluation method for asphalt surface color was established with the color parameter of Munsell Value, then two asphalts were adopted to study the influence of asphalt ageing on its surface color, and the mechanism of whitening was investigated by the four generic fractions experiment, color spectrum tests and scanning electron microscopy (SEM) test. The results show that the surface color of asphalt will be changed by some factors, while ageing is an important factor. The thermal-oxidative ageing (TOA) of asphalt would lead to the asphalt to be darker in color due to the component migration caused by ageing, while the ultraviolet ageing (UVA) of asphalt will result in a grey or white asphalt surface because of the fact that UVA makes the surface wrinkled and rough which would cause the asphalt surface to change from specular reflection to diffuse reflection. Since the whitening of asphalt surface caused by UVA is much more serious than the blacking caused by TOA, the asphalt pavement always tends to appear grey or white during its service life. To verify the close relationship between the surface color and UVA degree of asphalt, two modified asphalts with anti-ultraviolet ageing agents, carbon black and layered double hydroxides, were suffered from UVA, and their ageing degrees were assessed with the parameters of Munsell Value and conventional physical properties, results indicate the two evaluations on UVA degree have much consistency, which means it is feasible to adopt Munsell Value, a parameter of asphalt surface color, to evaluate the UV ageing degree of asphalt.

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A Novel Approach Based on Munsell Value for the Evaluation of Asphalt Aging Degree

Xu,

Wang,

Fang

et al. 2024

Int. J. Pavement Res. Technol.

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Spectral reflectance and chromaticity differences of various colors of interior finishing material samples under tunable LED lamps

Cited by 5 publications

References 25 publications

Analysis and Tunable Models for Phosphor-Converted White Light-Emitting Diode Based on Spectral Compensation

Analysis and Tunable Models for Phosphor-Converted White Light-Emitting Diode Based on Spectral Compensation

Evaluation of asphalt ageing degree based on asphalt color

A Novel Approach Based on Munsell Value for the Evaluation of Asphalt Aging Degree

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