Evaluation of window-tinting films for sunlight phototherapy
Journal of Tropical Pediatrics
Division of Neonatal and Developmental Medicine, Department of Pediatrics, Stanford University School of Medicine, Stanford, CA 94305-5208, United States; Center for Global Pediatrics, University of Minnesota, Minneapolis, MN 55414-1932, United States; De
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. © The Author . Published by Oxford University Press. All rights reserved.
article; blue light; controlled study; film; fluorescent lamp; human; infrared radiation; light irradiance; light irradiance meter; newborn jaundice; optical instrumentation; photometer; phototherapy; radiation equipment; reduction; reflector; sun; sun exposure; thermometer; ultraviolet A radiation; ultraviolet detector; bilirubin; Hyperbilirubinemia; Jaundice; Newborn; Phototherapy; Bilirubin; Feasibility Studies; Humans; Infant, Newborn; Infrared Rays; Jaundice, Neonatal; Phototherapy; Radiometry; Sunlight; Ultraviolet Rays