For quite a few years now, the lighting industry has been trying
to develop more energy efficient lighting. First they rolled out compact
fluorescent bulbs, but they contained mercury and quickly became a toxics
nightmare, both for accidental breakage and safe disposal.
So now they are moving forward very quickly with another
option, LEDs (Light Emitting Diodes). A light emitting diode converts
electricity into light. LED lights are very energy efficient, using about 85%
less energy than traditional incandescent lighting. Another positive is that
LEDs convert 95% of their energy into light and waste just 5% to heat, as compared
to traditional incandescent bulbs which do the exact opposite.
LED bulbs light our homes, schools, stores and businesses,
and they are found in street lights, car headlights and the LED screens on all
of our electronic devices.
However, there always seems to be a downside to new
technologies, and LED lighting is no exception. LED screens and bulbs emit
high-energy visible (HEV) “blue-white light”, which can permanently damage the
human eye in several ways and suppress the production of the hormone melatonin
which disrupts our normal circadian rhythm (sleep/wake cycle). Before LED
lighting, the only exposure we had to HEV light was the sun and the exposure
was relatively short-term. Now we are exposed from multiple sources indoors as
well, and the amount of time we are exposed is growing fast!
Read more about LED street lighting and breast cancer risk
here:
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