LED

Learn the basics of LEDs, their types, spectral properties, and benefits including efficiency, lifespan, and safe usage.

Key Takeaways

LEDs provide efficient, long-lasting, and safe lighting solutions.
White light from LEDs can be achieved via RGB modules or phosphor conversion.
LED retrofit lamps offer direct replacements for incandescent bulbs.
LEDs emit no IR or UV radiation, protecting sensitive materials.
LED technology is advancing to cover a wide visible spectrum with narrow spectral power distribution.

What the video covers

LEDs are small point light sources used individually or in clusters.
Optical materials help direct and screen light from LED chips or clusters.
LED retrofit lamps replace incandescent bulbs using LED chips with drivers in conventional lamp bulbs.
Spectral power distribution shows light power at each visible wavelength; LEDs have narrow spectra.
White LED light is created by combining red, green, and blue LED chips (RGB LED) or using blue LEDs with yellow phosphor.
White phosphor LEDs emit light across almost the entire visible spectrum.
LEDs have long lifetimes: 75,000 hours for professional luminaires and 20,000 hours for consumer retrofit lamps.
LEDs are energy efficient, comparable to CFLs and much more efficient than incandescent lamps.
LED light contains no infrared or ultraviolet radiation, making it safe for heat- or UV-sensitive materials.
Due to these advantages, LEDs are increasingly integrated into luminaires.

Chapters

What is an LED retrofit lamp?

An LED retrofit lamp is an LED chip or cluster with its driver encapsulated in a bulb with a conventional lamp foot, designed to directly replace incandescent lamps.

How is white light produced using LEDs?

White light can be produced by combining red, green, and blue LED chips in a single module (RGB LED) or by using a blue LED chip combined with yellow phosphor material, known as a white phosphor LED.

What are the main benefits of using LEDs?

LEDs offer long lifetimes (up to 75,000 hours for professional use), high energy efficiency, and emit no infrared or ultraviolet radiation, making them safe for heat- and UV-sensitive materials.

Full Transcript — Download SRT & Markdown

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In this nugget, we will learn the basic concepts of LEDs. Light Emitting Diodes, or LEDs, are small, point light sources that can be used individually or in a cluster of more than one chip.

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Optical materials can be used around the LED chip or cluster to direct and screen the light.

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If the LED chip or cluster, with its driver, is encapsulated in a bulb with a conventional lamp foot, we have a direct replacement for an incandescent lamp, which is called LED retrofit lamps.

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Spectral power distribution characterizes light by giving the power of light at each wavelength in the visible spectrum.

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The materials available today make it possible to produce LEDs in all colors. The spectral power distribution is always narrow.

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Since the spectrum of a single LED is always narrow, white LED chips cannot yet be produced.

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But white LED light can nevertheless be obtained by combining red, green, and blue LED chips into a single module or system to give white light.

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A single LED producing red, green, and blue light would therefore result in white light.

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This type of LED is called an RGB LED. It has four pins, one for each color and a common cathode.

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Good-quality white light can be obtained by using a combination of a blue LED chip and yellow fluorescent material called phosphor. This is called a “white phosphor LED.”

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This graph shows the spectral power distribution of such a white phosphor LED, from which it can be seen that now light is emitted over almost the whole of the visible spectrum.

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Using an LED has a multitude of amazing benefits. LEDs have a long life. The useful lifetime of professional luminaires is 75,000 and for consumer retrofit about 20,000 hours. LEDs are energy efficient.

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An LED lamp is as efficient as a CFL lamp and about six times as efficient as an incandescent lamp.

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Light emitted from LEDs does not contain any infrared or ultraviolet radiation. This makes the use of LEDs around heat-sensitive or UV-sensitive materials safe.

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Because of these benefits, more LEDs are being used as an integral part of luminaires. Thank you.

Topics:LEDLight Emitting DiodeRGB LEDWhite phosphor LEDSpectral power distributionLED retrofit lampEnergy efficiencyLong lifetimeLED benefitsSignify

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