Evaluation of window-tinting films for sunlight phototherapy

Hendrik J. Vreman, Tina M. Slusher, Ronald J. Wong, Stephanie Schulz, Bolajoko O. Olusanya, David K. Stevenson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We evaluated nine semi-transparent plastic window-tinting films for their ability to block ultraviolet A (UVA) and infrared (IR) radiation and transmit therapeutic blue light (400-520 nm) for treating jaundiced newborns. For indoor testing, three light sources (TL/52 special blue fluorescent, Black Light UVA and IR heat lamps) were positioned above each film and measured successively using a thermocouple thermometer, UVA radiometer and blue light irradiance meter, placed below each film. For outdoor testing, the same setup was used with the sun at zenith and a cloudless sky. Compared with unfiltered radiation, blue light transmission through films ranged from 24 to 83%, UVA transmission was 0.1-7.1% and reductions in IR heat were 6-12°C and 5-10°C for heat lamp and sun, respectively. The data suggest that most of the relatively low-cost window-tinting films tested can effectively reduce sunlight UV and IR and offer a range of significant attenuations of therapeutic blue light.

Original languageEnglish (US)
Article numberfmt062
Pages (from-to)496-501
Number of pages6
JournalJournal of tropical pediatrics
Issue number6
StatePublished - Dec 2013

Bibliographical note

Funding Information:
This work was supported by the Mary L. Johnson Research Fund, the Christopher Hess Research Fund and the H.M. Lui Research Fund.


  • Bilirubin
  • Hyperbilirubinemia
  • Jaundice
  • Newborn
  • Phototherapy


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