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Doctors Advise: Reduce Harm

Yes, sometimes it's difficult to listen to what your doctor says, but if you indeed want better health you heed professional advice and change your behavior. Last week the American Medical Association (AMA) released a policy statement on reducing the harmful effects of light pollution. If you don't believe me and my dark-sky rants, please consider your doctor's opinion.

Ophiuchus and Serpens, from "Atlas Coelestis" by Johan Cammayo.  Image credit: Jacopo Montano and Wikimedia Commons

As with the recent Atlas of Light Pollution, I encourage you to go straight to the source. Here is the statement in its entirety:

For immediate release: June 14, 2016

CHICAGO - Strong arguments exist for overhauling the lighting systems on U.S. roadways with light emitting diodes (LED), but conversions to improper LED technology can have adverse consequences. In response, physicians at the Annual Meeting of the American Medical Association (AMA) today adopted guidance for communities on selecting among LED lighting options to minimize potential harmful human and environmental effects.

Converting conventional street light to energy efficient LED lighting leads to cost and energy savings, and a lower reliance on fossil-based fuels. Approximately 10 percent of existing U.S. street lighting has been converted to solid state LED technology, with efforts underway to accelerate this conversion.

"Despite the energy efficiency benefits, some LED lights are harmful when used as street lighting," AMA Board Member Maya A. Babu, M.D., M.B.A. "The new AMA guidance encourages proper attention to optimal design and engineering features when converting to LED lighting that minimize detrimental health and environmental effects."

High-intensity LED lighting designs emit a large amount of blue light that appears white to the naked eye and create worse nighttime glare than conventional lighting. Discomfort and disability from intense, blue-rich LED lighting can decrease visual acuity and safety, resulting in concerns and creating a road hazard.

In addition to its impact on drivers, blue-rich LED streetlights operate at a wavelength that most adversely suppresses melatonin during night. It is estimated that white LED lamps have five times greater impact on circadian sleep rhythms than conventional street lamps. Recent large surveys found that brighter residential nighttime lighting is associated with reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, impaired daytime functioning and obesity.

The detrimental effects of high-intensity LED lighting are not limited to humans. Excessive outdoor lighting disrupts many species that need a dark environment. For instance, poorly designed LED lighting disorients some bird, insect, turtle and fish species, and U.S. national parks have adopted optimal lighting designs and practices that minimize the effects of light pollution on the environment.

Recognizing the detrimental effects of poorly-designed, high-intensity LED lighting, the AMA encourages communities to minimize and control blue-rich environmental lighting by using the lowest emission of blue light possible to reduce glare. The AMA recommends an intensity threshold for optimal LED lighting that minimizes blue-rich light. The AMA also recommends all LED lighting should be properly shielded to minimize glare and detrimental human health and environmental effects, and consideration should be given to utilize the ability of LED lighting to be dimmed for off-peak time periods.

The guidance adopted today by grassroots physicians who comprise the AMA's policy-making body strengthens the AMA's policy stand against light pollution and public awareness of the adverse health and environmental effects of pervasive nighttime lighting.


Media Contact: AMA Media and Editorial Pressroom: (312) 239-4991 Email:

While the AMA announcement is certainly good news, the regimen for good health goes further. Think moderation, as in, light only when and where needed, aim the light down, shield the light fully, use motion sensors where possible.

The image from Johan Cammayo's Atlas Coelestis depicts the constellation Ophiuchus, the Serpent-Bearer. The Rod of Asclepius, a single snake entwined around a wooden staff, is a common medical symbol.

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