Light and its Health
Effects
Chronobiology,
the influence of light exposure on humans in physical, mental, and behavioral
ways has recently become a focus of research and discussion. Do light and its
exposure affect humans? If so, in what ways? Light plays an important role in
the health of humans. It starts with the ways our bodies react to day and night
and our associations with that. We make these associations because it changes
the levels of melatonin produced within our bodies. Melatonin is a hormone that
helps promote sleep and helps us to alert appropriate times of day. Levels of Melatonin are connected to the
light taken in through the human eye.
Ganglion, a receptor cell in the human eye, senses slowly
changing light patterns. It sends these changes to the nerves which matches
brain and body responses to circadian rhythms. This transfer of information
affects the body’s endocrine, immune, cardiac, metabolic, behavior responses,
and more. Therefore, it is very important our bodies are taking in enough
sunlight throughout the day. If we do
not get enough natural light, we can develop, SAD. Seasonal Affective Disorder
is a disorder where depression occurs due to the lack of light. We can also develop
vitamin-D deficiency. This is where we do not receive enough vitamin-D our body
needs.
Because
of these medical issues related to exposure to natural light, studies have
started to see which lights help and which ones hinder us. One of the lights
that have found to help is the LED blue wavelength lights. These light bulbs
are found to slow down the release of melatonin. This allows one to stay awake
longer and be more alert. They have also seen higher memory and cognition
through people who have been exposed to blue wavelengths. However, though blue
wavelength lights have said to be better, one has to consider the intensity of
those lights. If a human is exposed to bright lights followed directly with no
light without a transition it is not a natural cycle. Therefore, using a dim
light to transition from a bright light to darkness is best. It will not take
one as long to fall asleep.
Though blue
wavelength lights and dim lights have helped humans in some way, we must also
consider the time exposed to light at night in excess can affect a human’s
weight. More hours awake and in the light, the more often one will eat and
consume. This can create health problems too.
Therefore,
it is best to follow the natural rhythms and characteristics of light when
designing a lighting environment. Allowing the light to be natural or follow
the natural pattern is best for our health. By doing this human health can
improve and we can still get the vitamin-D we need and can improve statistics
of people with SAD.
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