Select the INCORRECT statement with regard to LEDs.a)LEDs are available which emit light in different colors like red, green, and yellow.b)LEDs are rugged and therefore withstand shocks and vibrations.c)LEDs are suited for large area displays, primarily because of their low cost.d)LEDs are economical and have a high degree of reliability.Correct answer is option 'C'. Can you explain this answer? - EduRev Electronics and Communication Engineering (ECE) Question

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Select the INCORRECT statement with regard to LEDs.

a)
LEDs are available which emit light in different colors like red, green, and yellow.
b)
LEDs are rugged and therefore withstand shocks and vibrations.
c)
LEDs are suited for large area displays, primarily because of their low cost.
d)
LEDs are economical and have a high degree of reliability.

Correct answer is option 'C'. Can you explain this answer?

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Select the INCORRECT statement with regard to LEDs.a)LEDs are availabl...

Light Emitting Diode (LED):

LED stands for light-emitting diode. An LED is a semiconductor device, generating light through a process called electroluminescence. When we pass an electric current through semiconductor material, it emits visible light. As such, an LED stands in exact contrast to a photovoltaic cell, which is the cell used in solar arrays to convert visible light into electricity

Advantages:

Energy-efficient: LED’s are now capable of outputting 135 lumens/watt.
Long Lifetime: 50,000 hours or more if properly engineered.
Rugged: LED’s are also called “Solid-State Lighting (SSL) as they are made of solid material with no filament or tube or bulb to break.
No warm-up period: LED’s light instantly in nanoseconds.
Not affected by cold temperatures: LEDs “like” low temperatures and will startup even in subzero weather.
Directional: With LED’s we can direct the light where you want it, thus no light is wasted.
Excellent Color Rendering: LEDs do not wash out colors like other light sources such as fluorescents, making them perfect for displays and retail applications.
Environmentally friendly: LED’s contain no mercury or other hazardous substances.
Controllable: LEDs can be controlled for brightness and color.

Disadvantage

Blue hazard: There is a concern that blue LEDs and cool-white LEDs are now capable of exceeding the safe limits of the so-called blue-light hazard as defined in eye safety.
Light quality: Most cool-white LEDs have spectra that differ significantly from a black body radiator like the sun or incandescent light. However, the color rendering properties of common fluorescent lamps are often inferior to now available in state-of-art white LEDs.
Temperature dependence: LED performance largely depends on the ambient temperature of the operating environment.
Blue pollution: Cool-white LEDs (i.e., LEDs with high color temperature) emit proportionally more blue light than conventional outdoor light sources.
Voltage sensitivity: LEDs must be supplied with a voltage above the threshold and a current below the rating.
High initial price: LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than most conventional lighting technologies.
Area light source: LEDs do not approximate the “point source” of light, but rather a Lambertian distribution. LEDs are not suited for large-area displays.

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Select the INCORRECT statement with regard to LEDs.a)LEDs are available which emit light in different colors like red, green, and yellow.b)LEDs are rugged and therefore withstand shocks and vibrations.c)LEDs are suited for large area displays, primarily because of their low cost.d)LEDs are economical and have a high degree of reliability.Correct answer is option 'C'. Can you explain this answer?

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