Modeling of Light-Induced Changes in Reflectance Spectra: A Predictive Tool for the Effect of an Arbitrary Spectral Irradiance

Villmann, Beate; Peltri, Gregor; Weickhardt, Christian

doi:10.1080/00393630.2018.1486529

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…5,6 Photo damage in paper paintings is due to the photochemical reaction that occurs when the irradiated material absorbs the spectral energy of the light source, resulting in the denaturation of the functional groups of the material molecules, thus showing irreversible and permanent damage, such as fading and discoloration. 7,8 Galleries of paintings and artifacts are fully artificially illuminated environments, isolated from natural light, making artificial lighting the most important cause of damage to paintings. Contemporary museum lighting approaches aim to strike the right balance between two main themes: minimizing the potentially damaging effects of light on artworks and obtaining the optimum visual effect through light.…”

Section: Introductionmentioning

confidence: 99%

Design of comfortable light sources based on low damage spectrum of paper relics in the museum

Zhao,

Zhu,

et al. 2024

Opt. Eng.

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A museum is a historical and cultural center with important conservation significance. In this work, the minimum light damage spectrum of paper cultural relics and solar spectrum are mixed in 11 different proportions by MATLAB software. In addition, REDOX index and the full-spectrum index are used as evaluation indices to calculate the damage degree and comfort level of the mixed 11 spectra. The monochrome light emitting diodes (LEDs) on the market are investigated, and a simulation database of 109 monochromatic LEDs is established by using the state joint state density function as the spectral radiation model. The nine mixed spectra with solar spectral weights from 0.1 to 0.9 are used as the target spectra. The monochromatic LEDs and 2850 K warm white LED in the database are fitted to calculate the optimal solution, and the spectral combination scheme is obtained by parameter comparison. A hybrid light source is designed by LIGHTTOOLS simulation software, and chromaticity analyses are carried out for the five light sources with solar spectral weights of 0.1, 0.3, 0.5, 0.7, and 0.9. The results prove the feasibility of the theory of mixing the solar spectrum with the minimum light damage spectrum to improve the comfort and color rendering of the light source. This will have a certain guiding significance for the lighting of the museum.

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Section: Introductionmentioning

confidence: 99%

Design of comfortable light sources based on low damage spectrum of paper relics in the museum

Zhao,

Zhu,

et al. 2024

Opt. Eng.

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“…This will assist in the selection of the appropriate light source, which will inflict the least amount of damage to a particular artwork. 8…”

Section: Introductionmentioning

confidence: 99%

“…This will assist in the selection of the appropriate light source, which will inflict the least amount of damage to a particular artwork. 8 At present, there are two main methods used to evaluate lighting sources for cultural relics. The first is the colour temperature method, by which the protection of cultural relics is achieved by limiting the colour temperature of the light source.…”

Section: Introductionmentioning

confidence: 99%

Evaluation methodology for light sources used to illuminate highly photosensitive artwork

Zhang

Song

et al. 2022

Lighting Research & Technology

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Spectral energy radiated by light sources is the primary source of colour damage in highly photosensitive artworks (HPAs). However, spectral power distributions differ for different light sources, and the absorption and reflection characteristics of different materials, when irradiated by each narrow spectral energy band, also differ. This could result in large differences in the degree of radiation damage for materials under the same lighting intensity. In this paper, the suitability of different light sources used to illuminate HPAs was experimentally investigated over a long period of time by irradiating nine types of typical HPA materials with 10 different narrow-band light sources. By analysing the colour difference data of the illuminated material against the amount of exposure, a mathematical model relating the spectral composition and the damage to the colour of HPA materials was obtained. Based on this, a colour damage evaluation equation for light sources used for lighting HPAs was proposed. Finally, the equations were discussed using an example.

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“…The fundamental cause of color damage to dyed cultural relics is the photochemical reactions that occur after the illuminated pigment absorbs the spectral energy of a light source [7], [8]. However, the absorption and reflection properties of various types of pigments under the visible spectrum of different wavelength bands vary greatly, which is the basis of lighting protection to obtain the consistent influence of different wavelengths of visible light radiation on the color of various pigments.…”

Section: Introductionmentioning

confidence: 99%

Method to Obtain LED Spectrum Optimizing Protection Effect and Color Quality for Lighting Dyed Cultural Relics Painted With Inorganic Pigments

Song

Zhang

et al. 2021

IEEE Photonics J.

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Spectral radiation could cause color damage to dyed cultural relics, and finding a method to obtain a minimum-damage light source is a key issue to be solved. In this paper, the color change behavior of pigments under exposure was experimentally investigated by irradiating 17 typical inorganic pigments used for dyed cultural relics with 10 different narrow-band LED light sources. Through an analysis of the color difference of the test pigments against the amount of exposure, the responsivity equations of the pigments were obtained and a mathematical model for predicting the color damage degree was proposed. The 10 kinds of narrow-band light were combined to obtain 10 6 LED by using the exhaustive method. The Ra, R9, and -Duv-value of the above spectra were calculated. Ra≥90, R9≥0, and -Duv -≤0.0054 were taken as the evaluation basis, and 35,398 spectra that met color rendering requirements were obtained. The established mathematical model was used to calculate the color damage value to find the minimum-damage spectrum, which was then input into a Thouslite LEDCube system for reduction. An experiment was conducted among the minimum-damage LED and 3 randomly selected light sources, and results showed that the minimum-damage LED light source has an obvious illumination protection effect.

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Modeling of Light-Induced Changes in Reflectance Spectra: A Predictive Tool for the Effect of an Arbitrary Spectral Irradiance

Cited by 10 publications

References 6 publications

Design of comfortable light sources based on low damage spectrum of paper relics in the museum

Design of comfortable light sources based on low damage spectrum of paper relics in the museum

Evaluation methodology for light sources used to illuminate highly photosensitive artwork

Method to Obtain LED Spectrum Optimizing Protection Effect and Color Quality for Lighting Dyed Cultural Relics Painted With Inorganic Pigments

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