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Bert22306
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re: Cree claims LED price-performance breakthrough
Bert22306   2/7/2012 9:51:22 PM
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I don't think that SiC semiconductors are anything particularly new. And, according to http://www.nnin.org/doc/2004NNINreuVaughan.pdf when applied to LEDs, SiC seminconductors are used to create blue LEDs. That yellow colored phosphor is what changes to light to white. Here are the types of semicondictors used to create different colors, according to that URL: "Silicon carbide (SiC), indium gallium nitride (InGaN), and zinc selenide (ZnSe) produce blue LED’s. "Gallium phosphide (GaP), and gallium nitride (GaN) produce green LED’s. "Gallium arsenide/phosphide (GaAsP) produce red, orange and yellow LED’s. "Aluminum gallium arsenide (AlGaAs) produces red and infrared." It goes on to say that white light can be made by combining red, green, and blue, although I'm pretty sure that's the more expensive way of making a white LED. The cheaper approach is just to use a blue plus a phosphor.

AshokS
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re: Cree claims LED price-performance breakthrough
AshokS   2/7/2012 9:42:56 PM
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I think they do pay for themselves even at the current prices. I replaced 3 50W halogen bulbs on my kitchen hood with 8W LED lamps which are brighter which means I can operate them at a lower dimmer setting. Bulbs were $20 each. savings per year at 5hrs a day for 360 days at 11c per kWh = $7. so return is in 3 years approx. This is conservative since we now keeps the main kitchen lights off most of the time since all we need is lights over the stove at least in the daytime. Earlier, we had to turn all the lights on for an extra 65W for 5x13W CFLs.

Robotics Developer
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re: Cree claims LED price-performance breakthrough
Robotics Developer   2/7/2012 9:30:55 PM
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Given the cost of the bulbs, the savings can accrue over time but with the limited lifetimes (power electronics typically) I am not sure the bulbs will ever pay for themselves based on electrical usage. I do know that in a number of applications they are very nice - quick to start and energy efficient (more for the PR and customer experience than real savings). Some companies will want to jump on the bandwagon just for the green-ness of the bulbs, again maybe more PR than anything else.

qerqwe
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re: Cree claims LED price-performance breakthrough
qerqwe   2/7/2012 9:15:58 PM
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"very reliable, trust us" Actually I would expect the LEDs themselfs to OK, it is everything else. So far I have not heard of any benefit of purchasing such technology for my home.

Sanjib.A
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re: Cree claims LED price-performance breakthrough
Sanjib.A   2/7/2012 6:17:19 PM
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Well, what is the reliability or life of these silicon carbide technology based LED lamps from Cree vs. the current LED technologies?

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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