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Led Light Bulbs
Light-emitting diode, or LED, light bulbs were developed in the 1960s for
use as indication lights. Early LED lights were available only in red, and
the amount of light produced was minimal. However, recent advancements
have developed LED light bulbs as a bright and very useful source of
lighting. These lights are highly energy efficient, long lasting and
purely electronic. In other words, LED lights produce very little waste
that many lights produce, mostly in the form of heat.
LEDs are based on a polar mechanism; that is, there is a cathode (negative
terminal) and an anode (positive terminal). The amount of light given off
is not a result of voltage or wattage, but is instead based on the shape
and curvature of the housing surrounding the lens. The wider the housing
is, the tighter the focus, and therefore the brighter the beam. Therefore
LED light bulbs are measured not by the light output, but by the radius of
curvature, typically by millimeter.
Though the best lights are expensive, the most common function of the LED
is for its valuable utility. In fact, most traffic lights, previously
using incandescent halogen bulbs, now use LED light bulbs for their energy
efficiency and overall cost effectiveness. Although individual LED lights
may be more expensive than normal incandescent lights, they last much
longer, are five to six times less power consumptive than comparable
incandescent, and are therefore cheaper to operate in the long run.
Besides being used for traffic lights, LED lights are also commonly seen
in emergency exit signs, car lighting, and are highly effective as spot
lighting--hikers and cavers, among other hobbyists consider LEDs to be
extremely valuable lighting tools because of their ability to produce a
long-lasting high beam.
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