Light. LED 2 Flashcards

0
Q

“An LED is what’s called a “solid-state lighting” technology, or SSL. Basically, instead of emitting light from a vacuum (as in an incandescent bulb) or a gas (as in a CFL), an SSL emits light from:

A

a piece of solid matter. In the case of a traditional LED, that piece of matter is a semiconductor.

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1
Q

Stated very simply, an LED produces light when:

A

“electrons move around within its semiconductor structure.”

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2
Q

The problem with LEDs so far is that:

A

they tend to be much dimmer than incandescents or CFLs, and much more expensive.

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3
Q

It mainly comes down to energy efficiency. Incandescent bulbs waste most of their energy on heat, not light. A much higher percentage of energy going into an LED bulb is converted to light, which means:

A

less energy is needed to make the bulb function. Beyond efficiency, LEDs simply last longer, outlasting even CFLs.

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4
Q

The newest LED bulbs to be developed - ________________- will last as long as 100,000 hours (equivalent to 60 years) and are three times as energy efficient as CFLs.

A

gallium nitride based bulbs

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