Led traffic lights make great contributions to our life
Posted in the Weird Forum
#1 Jun 20, 2013
We can see many led traffic lights http://www.nobleled.com/ in the super highways and streets, but, do you know that our life has changed a lot due to them? Here, I would like to share some of my opinions with you, and I hope after writing, you may have a clearer cognition about them.
The development of commercially feasible led traffic lights was originally hampered by the limitation of Light Emitting Diodes (LEDS). LEDs generate light as a result of electrical current running through certain gases. At first, LEDs could only produce the color red, which limited their use to monochromatic devices such as alarm clock displays or calculators. Further refinements in the technology have now produced the three colors used for traffic signalling: red, amber and green.
One major advantage of these traffic lights is increased visibility. Incandescent bulbs were often covered by color filters, reflectors, and glass lenses, which could affect how much light actually reached drivers' eyes. led traffic lights use an array of bright LEDs that do not require additional filters or amplification. If a single incandescent bulb burns out, the entire light sequence is disturbed. Several LEDs can fail in these lights without causing a noticeable disruption. A catastrophic failure involving all of the LEDs in a panel would be rare indeed.
Since: Aug 12
#2 Jun 20, 2013
yep traffic lights are great.
Never given it much thought... the things we take for granted huh
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