# New Ways to See Lighting and Fading Data

Sophie Vogelsang's 2021 Junior Fellow project explored how data from fade-testing and lighting surveys can be effectively analyzed to provide new insights into the fading of objects under varied lighting conditions. Incorporation of data from LEDs and older light sources will facilitate future discussions around the use of different lighting systems in collections and exhibit spaces. Vogelsang developed data analysis methods that enable the calculation and visualization of colorimetric values from reflectance data as well as direct comparisons between microfade-testing (MFT) instrument light sources and lighting conditions from relevant settings. Light damage is a significant concern for long-term preservation and safe exhibition of collections items. The Preservation and Research Testing Division (PRTD) regularly performs non-destructive MFT to assess the light sensitivity of objects for exhibition. PRTD also collects readings of light levels and emission spectra in Library spaces to evaluate lighting conditions experienced by collections items. As many institutions including LC transition to LED lighting systems, establishing how items fade under LED light is important for collections care decisions. PRTD is one of the few institutions equipped with MFT instruments with both broadband xenon and LED light sources, enabling evaluation of an object's fading under different light sources.

- Kind: Talk
- Year: 2021
- By: Library Of Congress. Preservation Directorate
- Archive: [Library of Congress](https://www.loc.gov/item/2024697563/)
- Licence or status: Rights statement at the Library of Congress (as the archive states it)
- Credit: Library of Congress
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/loc/2024697563?play=1)