Effects of light on melatonin production

  • Philip Boyce
    Address reprint requests to Dr. Philip Boyce, School of Psychiatry, University of New South Wales, P.O Box 1, Kensington, N.S.W. 2033, Australia
    From the School of Psychiatry, University of New South Wales, KensingtonAustralia

    the Mood Disorders Unit, Prince Henry Hospital, Little BayAustralia
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  • David J. Kennaway
    Department of Obstetrics and Gynecology, University of Adelaide, Adelaide, Australia
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      A study was carried out to determine the intensity of light necessary to suppress melatonin. Ten normal subjects were exposed to four light intensities of 1000, 1500, 2000, and 2500 lux for 2 hr on different occasions, and melatonin levels were measured during exposure. All light intensities suppressed melatonin significantly, but none to daytime levels, with 2500 lux appearing to be the most “potent.”
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