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Introduction
Light is one of the most persistent and contradictory agents of deterioration in preventive conservation. It’s essential for presenting, interpreting, and appreciating cultural heritage, at the same time it can cause irreversible damage to many materials. Unlike agents such as fire or water, light rarely leads to sudden destruction; instead, it acts gradually and often invisibly, producing physical and chemical changes each time an object is exposed.
The management of light damage in museums therefore involves resolving an important ethical dilemma often described as “see versus save.” As Michalski explains, “objects need light to be seen, but light damages them” (Michalski 2018, 2). Museums must therefore balance the need to provide visual access to collections with the responsibility to preserve them for future generations. As Michalski further notes, this requires balancing “the rights of our own generation with the rights of all future generations” (Michalski 2018). Because light damage is cumulative and irreversible, preventive conservation approaches this issue through strategies of risk management and controlled exposure.
This annotated bibliography aims to analyse how accurately light as an agent of deterioration is presented in reference texts derived from Risk Management for Collections by Agnes Brokerhof, Bart Ankersmit, and Frank Ligterink, and to compare this information with the educational video clip on agents of deterioration from the Dig It With Raven YouTube channel. While such videos aim to introduce conservation concepts to a broader audience, they often simplify or omit aspects that are essential for professional preventive conservation practice.
The central research question guiding this bibliography is therefore: How accurate and complete is the information about light as an agent of deterioration presented in the video clip when compared with professional sources on preventive conservation?
Sources
Brokerhof, Agnes, Bart Ankersmit, and Frank Ligterink. 2017. Risk Management for Collections. Amersfoort: Cultural Heritage Agency of the Netherlands.
Their publication combines scientific explanation with institutional risk analysis, prioritisation, and practical decision-making. Its value lies not only in defining light as an agent of deterioration, but in embedding it within a larger preventive conservation strategy.
The chapter on light explains that damage depends on three interacting variables: intensity, duration of exposure, and material sensitivity. The authors distinguish between visible light, ultraviolet radiation (UV), and infrared radiation (IR), and links these forms of radiation to specific mechanisms of damage. The authors state that “Damage depends on the interaction of light intensity, exposure time, and material
sensitivity.” (Brokerhof, Ankersmit and Ligterink 2017, 137). This confirms that the clip is broadly accurate when it identifies light as necessary but dangerous, and when it presents the damage as cumulative and irreversible. However, the source also demonstrates that the clip remains incomplete The video explains the basic principle clearly, but does not fully address the professional risk-management dimension: the role of exposure calculations, acceptable loss, building design, barriers, or the importance of controlling change rather than simply lowering lux.
Michalski, Stefan. 2016. “Agent of Deterioration: Light, Ultraviolet and Infrared.” In Agents of Deterioration****. Ottawa: Canadian Conservation Institute.
Stefan Michalski is a leading authority in preventive conservation and risk management.This source is central to the research question because it provides the clearest theoretical explanation of how light functions as an agent of deterioration and therefore serves as one of the strongest tests of the clip’s accuracy.
Michalski explains the central museum dilemma directly: objects need light to be seen, but light damages them. He distinguishes clearly between visible light, ultraviolet radiation, and infrared radiation, and links each to a different type of effect. He also introduces key measurement concepts such as lux, lux hours, and UV content in microwatts per lumen.Particularly useful is his discussion of perception and thresholds of visible change. This source shows that the clip is accurate when it presents UV as especially dangerous and visible light as a major cause of fading. However, it also reveals that the video presents UV radiation as the main risk but does not explain the concept of cumulative light dose (lux hours), which is central to professional preventive conservation. As a result, the clip overlooks important concepts such as dose–response thinking, measurable cumulative exposure, and the perceptual considerations used to establish museum lighting policies.
Ashley-Smith, Jonathan, Alan Derbyshire, and Boris Pretzel. 2002. “The Continuing Development of a Practical Lighting Policy for Works of Art on Paper and Other Object Types at the Victoria and Albert Museum.” In Preprints of the 13th ICOM-CC Triennial Meeting Rio de Janeiro , Vol. 1, 3–8. London: ICOM-CC.
Ashley-Smith, Derbyshire, and Pretzel translate preventive conservation theory into museum policy. As conservators at the Victoria and Albert Museum, they are especially significant because they move beyond general statements about light damage and show how professional institutions turn scientific evidence into practical exhibition rules. This source is therefore essential for evaluating whether the clip provides enough information for preventive conservation decision-making.
Druzik, James R., and Stefan Michalski. 2011. Guidelines for Selecting Solid-State Lighting for Museums****. Los Angeles and Ottawa: Getty Conservation Institute and Canadian Conservation Institute.
Druzik and Michalski’s guideline is a professional technical document focused on modern museum lighting, particularly solid-state lighting such as LEDs. This source is especially important because it addresses a topic that is often simplified in public explanations of preventive conservation: the assumption that LED lighting is automatically safe for museum collections. The guideline explains how solid-state lighting functions and evaluates it in terms of spectral output, ultraviolet emission, infrared heat, colour rendering, and thermal management. In general, the authors confirm that LEDs offer important preservation advantages because they typically emit very little ultraviolet and infrared radiation and can significantly reduce energy consumption. For example, the J. Paul Getty Museum reported an 83% reduction in lighting power when replacing 60W halogen lamps with 12W LEDs. However, the guideline also highlights important limitations, warning that some LED products use violet chips with peaks around 405 nm that have not been demonstrated safe for light-sensitive museum artifacts (Druzik and Michalski 2011). This nuance is absent from the video clip, which presents LEDs simply as a safe solution. The source therefore confirms the general validity of the clip’s recommendation while also demonstrating that professional lighting decisions require detailed analysis of spectral power distribution, colour rendering, flicker, and product quality rather than relying solely on broad lamp categories. Because the guideline is produced by the Getty Conservation Institute and the Canadian Conservation Institute, it is considered highly authoritative, although its primary focus is technological implementation rather than theoretical discussion.
Ford, Bruce, and Nicola Smith. 2011. “Lighting Guidelines and the Lightfastness of Australian Indigenous Objects at the National Museum of Australia.” In Preprints of the 16th Triennial Conference, ICOM-CC, Lisbon****.
Ford and Smith provide an applied case study that demonstrates how general light policies can be refined through object-specific testing. Their work is particularly relevant because it shows how museums move beyond broad categories of sensitivity and develop more precise, evidence-based exhibition strategies. This is important for the research question because the clip explains damage in general terms, but does not address how professionals determine actual sensitivity in individual objects.
The article describes the use of a microfade tester to assess the lightfastness of over 200 objects in the National Museum of Australia. The method uses a very small beam, around 300–400 μm, with intensities up to 10 megalux, and compares changes against Blue Wool standards. About 50% of the tested objects were more stable than expected. This source reveals that the clip omits one of the most important developments in contemporary preventive conservation: the move from generic sensitivity categories to tested, collection-specific evidence. At the same time, it supports the clip’s broader point that exposure
time and material type matter. The study is highly reliable, though its methodology has limitations: the microfade method may overestimate fading rates because of the xenon spectrum used, and the case study is based on a specific ethnographic collection. Still, its methodological value is widely applicable.
Canadian Conservation Institute. 2014. Light Damage Calculator****.
The Institute is a technical digital tool rather than a traditional academic text, but it is highly relevant to preventive conservation practice. Its importance lies in making abstract concepts such as cumulative exposure and colour change visible and measurable. This makes it especially useful for evaluating whether the video clip provides a sufficiently complete understanding of light damage.
The calculator estimates fading based on available scientific data and allows users to compare different exposure scenarios, model collections, and visualise both original and faded colours. It also provides numerical colour-change values such as ΔE, allowing users to connect visual perception with quantitative measurement. This source supports the clip when it states that light damage accumulates over time. However, it also reveals that the clip remains at a general explanatory level and does not introduce the predictive tools used in professional practice. The calculator makes clear that preventive conservation today is not based only on warnings or rules of thumb, but also on modelling, simulation, and comparative scenario planning Even so, it demonstrates a level of decision support absent from the clip.
Padfield, Joseph. 2015. Spectral Power Distributions (SPD) Curves****. London: The National Gallery.
Its value lies in showing that light cannot be assessed adequately through lux alone. This makes it particularly useful in identifying one of the clip’s major simplifications.
Padfield explains that lux measures perceived brightness, but not the full spectral composition of a light source. Two lamps can produce similar lux levels while distributing energy very differently across wavelengths, which affects colour rendering and conservation risk. The source therefore helps explain why professional lighting assessment must consider full spectral power distribution rather than brightness alone. This source complicates the clip’s simplified explanation of lighting by showing that the professional problem is not only how much light reaches an object, but also what kind of spectrum is involved.. The resource is highly reliable because it comes from the research department of the National Gallery, although it functions more as a technical professional tool than as a fully interpretive academic source. It is most useful for advanced measurement and comparison.This perspective highlights an important limitation of the clip, which focuses primarily on lux levels rather than spectral analysis.
Conclusion
Padfield, Joseph. n.d. The National Gallery Spectral Power Distribution (SPD) Curves. London: The National Gallery. Accessed October 21, 2016. http://research.ng-london.org.uk/scientific/spd/?page=home.
Saunders, David, and Jo Kirby. 2008. “A Comparison of Light-Induced Damage under Common Museum Illuminants.” In ICOM Committee for Conservation, 15th Triennial Meeting, New Delhi: Preprints , vol. 2, 766–774.
