With the prices of fossil fuels on the rise as well as pollution, the world
has been forced to seek energy saving solutions to soaring costs, and environmental
quality. With the technology of light emitting diodes cities across the
country have found a way to reduce the energy costs by replacing old incandescent
light bulbs with light emitting diodes in traffic signals. There are about
260,000 intersections with traffic signals in the United States. It has
been estimated that if all these intersections had LEDs in the traffic signals,
over three billion kilowatt hours of electricity could be saved yearly.
The average price of a kilowatt hour is about four cents, so that would
be a savings of about 120 million dollars a year in energy consumption.
The potential savings has prompted many cities to pursue energy savings
contracts in order upgrade there traffic signals.
Safety & Reliability
Not only do LEDs provide energy savings, they also work longer without
failing. The typical LED will last from five to ten years, where the
incandescent light bulb burns out a least once a year. This greatly
reduces cities’ maintenance
schedules as well as cutting the cost of replacing incandescent bulbs.
This increases the safety of the traffic signals, and reduces the number
due to traffic signals being out of commission.
The reliability which LEDs have is due to there design, which implements
semiconductor technology. This means that semiconductor material is used
to emit light, and there are no flimsy filaments to fail, as in incandescent
bulbs. Also the LED traffic signals are implemented with many LEDs, so if
one of the LEDs fails within the unit, the unit still works. No only is
the LED longer lasting and more efficient it also focuses the light better,
making the traffic signal easier to see for on coming traffic. This helps
reduce accidents, because drivers are able to see the signal better.