A Berkeley Lab FLEXLAB case study published in 2024 reported that testing helped Lucent Optics redirect window-film development from daylight redirection toward solar control.
Three prototypes were compared with two reference conditions: bare glazing and a commercial tinted film chosen to match one prototype’s solar heat gain coefficient. Testing covered spring and fall conditions and two window orientations, with each condition evaluated over a full day.
Daily cooling energy was generally lower with the prototypes. Daylight and glare results were more mixed: useful daylight improved in some configurations and declined in others, while one west-facing test worsened the reported glare measure.
The study therefore offers development evidence, rather than a universal savings claim. Its full-scale test cells were not a long-term survey of occupied buildings, and the publication does not establish a retail launch for the prototypes.
Sources & reporting notes
- Improving window films to reduce cooling loads and glare Lawrence Berkeley National Laboratory FLEXLABExact publication day not given.
- Lucent Optics FLEXLAB case study Lawrence Berkeley National Laboratory FLEXLABYear established by case-study landing page; filename not used as publication day.
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