Lumileds Lighting: the motion picture

Lumileds now offers a super-cool video on their site. It includes a virtual tour of the Lumileds manufacturing facility, and great information that explains some basic LED technology. Check it out ...
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Philips nanoleds

The smart folks over at Philips nanotechnology research have been growing indium phosphide (InP) nanowires. One of thier hopes is that the one-dimensional structure will eventually allow greater efficiencies. The ...
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Scientists develop novel multi-color light-emitting diodes

This is a press release from Los Alamos National Laboratory that describes an interesting breakthrough in LED physics. This is notable for a couple resaons: it opens up a new ...
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LEDs that heal

NASA and Medical College of Wisconsin have a page detailing the medical applications of near-infrared LEDs. I have to tell you, I would normally be highly skeptical of claims like ...
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What is thermal runaway?

When a junction gets warmer, the current through it at a given voltage will increase. The increased current in turn heats the junction further, and the problem gets worse. Eventually, ...
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How do I convert between candelas and lumens?

You can’t directly convert since they measure different things. The most useful explanation I’ve found is that lumens measure light output at the source, while candelas measure the light emitted ...
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Are LEDs inherently directional?

No. One way for a manufacturer to boost the luminous intensity spec (usually given in candelas or millicandelas) is to focus the beam more tightly. The same light flux, focused ...
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What happens if I overdrive an LED?

A typical indicator LED will have a spec that represents a typical point along the operating curve. That would look something like “3.3V @ 20mA typical.” Driving this LED above ...
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What are the electrical characteristics of LEDs?

It’s useful to think about two main types of LEDs—the familiar indicator LEDs that come in 5mm and 3mm epoxy packages, and “illumination-grade” LEDs, which are high-output devices, designed for ...
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How do they make white LED light?

There’s two main ways to get white light from LEDs: The first method is to combine light from red, green, and blue colored LEDs. If you get the right mix, the ...
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