Light at night in our bedrooms

Mariana G. Figueiro, Mark S. Rea, Jennifer A. Brons

Research output: Contribution to specialist publicationArticle

Abstract

Several studies have confirmed that Light at Night (LAN) can slow down melatonin production at night, increasing the risk of breast cancer (BC). One group of epidemiologists has recently shown that there is an association between LAN and BC incidence based on satellite photometry, suggesting that outdoor lighting might be a risk factor for BC. In one study, the authors utilized the photometric values derived from the U.S. Air Force Defense Meteorological Satellite Program Operation Linescan System (DMSP-OLS) images to characterize LAN exposures. The results showed that 99 percent of the nighttime photometric measurements in the teachers' bedrooms and at the windows were below 1 lux and all were below the expected threshold for stimulating the human circadian system. It is now possible to actually measure personal circadian light exposures over an extended time.

Original languageEnglish
Pages50-53
Number of pages4
Volume41
No12
Specialist publicationLighting Design and Application: LD and A
StatePublished - Dec 2011
Externally publishedYes

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