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Light in school buildings

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Light in school buildings traditionally is from a combination of daylight and electric light to illuminate learning spaces (e.g. classrooms, labs, studios, etc.), hallways, cafeterias, offices and other interior areas. Light fixtures currently in use usually provide students and teachers with satisfactory visual performance, i.e., the ability to read a book, have lunch, or play basketball in a gymnasium. However, classroom lighting may also affect students' circadian systems, which may in turn affect test scores, attendance and behavior.[1]

Exposure to light, or lack thereof, plays a significant role in sleep cycles. All animals, including humans, have evolved circadian rhythms, which respond to the earth's 24-hour cycle. These rhythms include the sleep–wake cycle, hormone production, and core body temperature cycles. The timing of these patterns is set by the 24-hour light–dark cycle. In particular, short-wavelength "blue" light in the daylight spectrum has maximal effect on human circadian rhythms. Research has shown that when these patterns are disrupted, individuals are more susceptible to ailments such as breast cancer, obesity, sleep deprivation, mood disorders, and other health problems.[2][3][4][5]

According to Energy Star, after salaries and benefits, energy costs are the largest operating expense for school districts.[6] Fluorescent lighting systems are the most prevalent sources of illumination in schools. These systems provide low cost, long life, high efficacy, good color, and low levels of noise and flicker. Lighting systems should be designed with respect to the requirements of the activity to be performed. For instance, lighting over a desk should be different than light required in cafeterias or hallways.[7] Current sustainable design guidelines for schools usually focus only on energy-conserving luminaires with consideration only for visual needs. Several aspects of building performance, including lighting, are fundamental in providing an environment that is conducive to learning. Facility aspects such as security and safety, indoor air quality, thermal comfort, visual comfort, and acoustic comfort conditions can affect attendance, teacher turnover rates, and occupant health.[6]

A university building designed to be primarily lit by daylight during operating hours.

Studies regarding whether daylight improves student performance (e.g., higher test scores) are inconclusive. The Heschong-Mahone Group's studies between 1999 and 2003 reported early on[8] that daylight increased academic results by 20%, but because their model was used incorrectly, it was later demonstrated that there was no significant variance due to sunlight.[9][10]

A 2009 study showed that when students were not exposed to daylight in the early part of the day, sleep times were pushed later into the evening/night.[11][12]

Measuring light

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Typical measurements of light have used a dosimeter. Dosimeters measure an individual's or an object's exposure to something in the environment, such as light dosimeters and ultraviolet dosimeters.

Application and effect

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Ongoing research in the light and health field will have implications on school architecture and design because studies show that it is necessary to expose students to short-wavelength light during the early part of the day to maintain circadian entrainment. Implementing "circadian light" treatment could be in the form of windows, skylights, or blue indoor lighting fixtures or blue light therapy devices.[13][1] There is also evidence that exposing rooms to natural daylight will make a room feel larger and more comfortable.[14] However there are tradeoffs, as direct penetrating sunlight can have negative effects on productivity and comfort.[15]

See also

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References

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  1. ^ a b National Research Council, "Lighting and Human Performance" Chapter 5 in Green Schools: Attributes for Health and Learning. Washington, D.C.: The National Academies Press, 2007.
  2. ^ Stevens, Richard G. (April 1987). "Electric Power Use and Breast Cancer: A Hypothesis". American Journal of Epidemiology. 125 (4): 556–561. doi:10.1093/oxfordjournals.aje.a114569. eISSN 1476-6256. ISSN 0002-9262. PMID 3548332.
  3. ^ Stevens, Richard G.; Rea, Mark S. (2001). "Light in the built environment: potential role of circadian disruption in endocrine disruption and breast cancer". Cancer Causes and Control. 12 (3): 279–287. doi:10.1023/a:1011237000609. ISSN 0957-5243. PMID 11405333.
  4. ^ Schernhammer, E. S.; Laden, F.; Speizer, F. E.; Willett, W. C.; Hunter, D. J.; Kawachi, I.; Colditz, G. A. (17 October 2001). "Rotating Night Shifts and Risk of Breast Cancer in Women Participating in the Nurses' Health Study". JNCI Journal of the National Cancer Institute. 93 (20): 1563–1568. doi:10.1093/jnci/93.20.1563. eISSN 1460-2105. ISSN 0027-8874. PMID 11604480.
  5. ^ Schernhammer, E. S.; Laden, F.; Speizer, F. E.; Willett, W. C.; Hunter, D. J.; Kawachi, I.; Fuchs, C. S.; Colditz, G. A. (4 June 2003). "Night-Shift Work and Risk of Colorectal Cancer in the Nurses' Health Study". JNCI Journal of the National Cancer Institute. 95 (11): 825–828. doi:10.1093/jnci/95.11.825. eISSN 1460-2105. ISSN 0027-8874. PMID 12783938.
  6. ^ a b "Energy Star Building Upgrade Manual Facility Type: K–12 Schools Chapter 10" (PDF). Energy Star.
  7. ^ IEC Handbook
  8. ^ Heschong-Mahone Group. 1999. Daylighting in Schools: An Investigation Into the Relationship Between Daylighting and Human Performance. Fair Oaks, CA: Heschong-Mahone Group.
  9. ^ Boyce, P.R. 2004. Reviews of Technical Reports on Daylight and Productivity. Troy, NY: Lighting Research Center. Available at www.daylightdividends.org
  10. ^ Heschong-Mahone Group. 2003. Windows and Classrooms: A Study of Student Performance and the Indoor Environment. P500-03-082-A-7. Fair Oaks, CA: Heschong-Mahone Group. pp. viii
  11. ^ Figueiro, Mariana G.; Rea, Mark S. (2010). "Lack of short-wavelength light during the school day delays dim light melatonin onset (DLMO) in middle school students". Neuro Endocrinol Lett. 31 (1): 92–96. PMC 3349218. PMID 20150866.
  12. ^ Wolfson, Amy R.; Carskadon, Mary A. (August 1998). "Sleep Schedules and Daytime Functioning in Adolescents". Child Development. 69 (4): 875. doi:10.2307/1132351. ISSN 0009-3920. JSTOR 1132351.
  13. ^ "Press Releases | LRC Newsroom".
  14. ^ Robbins, C.L. (1986). Daylighting Design and Analysis. New York, NY, USA: Van Nostrand Reinhold.
  15. ^ Eric Brossy De Dios, T.R. (2010, February 1). Integrating Daylight into School Design From the Start. Light Moves American School and University.
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