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Human Health
Visible light is part of the electromagnetic spectrum (EM Spectrum), which contains many types of radiation. Below the visible range are infrared, microwave, and radio waves. Above the visible range are ultraviolet, X‑rays, and gamma rays.
Radiation can be either ionizing or non‑ionizing. Ionizing radiation has enough energy to remove electrons from atoms, creating free radicals that can damage cells. Non‑ionizing radiation does not produce free radicals, though it can still cause other types of harm. Ionizing radiation includes ultraviolet light, X‑rays, and gamma rays.
While visible light is not typically considered ionizing, research is emerging that links high‑energy blue light within the visible range to the production of free radicals in the body. These radicals can damage cells and may contribute to cancer risk.
What is certain is that blue light reduces the body’s production of melatonin, the hormone that regulates sleep. Lower melatonin levels make it harder to fall asleep and to achieve deep, restorative rest, disrupting the circadian rhythm. This disruption is linked not only to insomnia but also to increased daytime stress, higher rates of depression, elevated blood pressure, greater stroke risk, and an increased likelihood of Alzheimer’s disease.
Studies show that people living in areas with high light pollution report these health problems at higher rates. The cause is increasingly tied to excessive artificial light at night.
Communities and individuals can take steps to reduce light pollution and protect health. Shield outdoor fixtures to direct light downward, choose warmer color temperatures, and install motion‑activated lighting. At home, turn off unnecessary lights, remove TVs from bedrooms, and put phones away at least an hour before bed. Many devices offer blue light filtering settings, and free apps like Twilight for Android can help reduce exposure.
By using light more thoughtfully, we can safeguard our health, restore the natural night environment, and preserve our view of the stars.
Parks Rx America
It has shown that spending time outdoors reduce levels of stress, depression, and obesity. Parks Rx is a non-profit that facilitates physicians to prescrbe outside time during their councelings. Connecting the public to their nature is a great way to begin healing. If its a evening stroll, a backpacking trip, or connecting with your local astronomy club to join in on a cosmic journey, find some way to reduce your light pollution and connect with nature. Learn more on ParkRxAmerica.org.
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