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Cree claims LED price-performance breakthrough

2/7/2012 05:02 PM EST
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Bert22306
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re: Cree claims LED price-performance breakthrough
Bert22306   2/8/2012 9:45:24 PM
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Good point. Also because, LEDs tend to become gradually dimmer with age. Although this happens so gradually that people don't usually notice. So "lifetime" needs to consider replacement just because of lost lumens. We have noticed this dimming over time with CFLs, more pronounced in the ones with very small twisty part, enclosed in a light bulb-like glass cover.

Sakthidaran, R.T.
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re: Cree claims LED price-performance breakthrough
Sakthidaran, R.T.   2/11/2012 10:14:12 AM
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Cree 231 Lumen Per Watt LED Shatters LED Efficacy Records – was the news reported on May 9, 2011. http://www.cree.com/press/press_detail.asp?i=1304945651119 Now, it reports 148 LPW as an achievement. ???

Sanjib.A
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re: Cree claims LED price-performance breakthrough
Sanjib.A   2/11/2012 3:32:44 PM
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I agree with you to some extent. I am concerned that in the cost sensitive regions of the world (e.g. India) it might take some more time to accept the LED lamps. Going with the experience with the CFL lamps: the CFL lamps were costly (they are still) when launched compared to incandescent lamps or the fluorescent lamps, but over last 5-7 years CFL lamps have become popular in India. It was partly because of your logic, some people were not so cost obsessive, may be because the cost of CFL lamps justified over the energy saving over the incandescent lamps…some due to the spreading of the awareness, marketing etc. But the cost of LED lamps is too high compared to the benefits that could be explained to these people.

DrQuine
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re: Cree claims LED price-performance breakthrough
DrQuine   2/11/2012 4:37:44 PM
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Can we believe lifetime estimates? When CFL bulbs were launched, they were touted as having 7 year lifetimes. Not including the infant mortality (5% of bulbs failed out of the box), I'd guess that 25% failed within a year. While they all got replaced at no cost, the mismatch between reported and actual lifetimes was striking. At least the CFL bulbs were cheap. LED bulbs are not.

DrQuine
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re: Cree claims LED price-performance breakthrough
DrQuine   2/11/2012 4:46:57 PM
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Can we skip LED lights and go straight to 4 color diode laser white lights? "Photonics Spectra" (Jan 2012, page 20) reports that Sandia National Laboratory has produced white light that is superior in quality to current lighting technologies. They claim diode laser lights can also scale to brighter level than can be achieved with LEDs (which lose efficiency above 0.5 amp currents).

ramstar
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re: Cree claims LED price-performance breakthrough
ramstar   2/11/2012 6:03:33 PM
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Our electric utility companies distributed many CFL bulbs for free, or at greatly reduced cost when they first came out. The fact that each CFL contains a small amount of mercury makes them much less desirable than LED's when you take into account the disposal cost.

Bert22306
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re: Cree claims LED price-performance breakthrough
Bert22306   2/12/2012 11:50:33 PM
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We haven't anything remotely close to that. The CFL brands we buy are Sylvania or UtiliTech, which are sold at Best Buy. We've had much better luck than what you describe. Basically, one failure that was premature, within maybe less than a year, one failure in a couple of years (which is also premature, in my book), and the rest keep soldiering on for many years. As to going to laser lights, interesting concept. I wonder if the coherent nature of laser won't create some weird phenomena?

daleste
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re: Cree claims LED price-performance breakthrough
daleste   2/13/2012 1:31:23 AM
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Laser lights. Interesting. How is the light dispersed? I wouldn't want just one little dot of light in the middle of the room.

Larry.Cormier1
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re: Cree claims LED price-performance breakthrough
Larry.Cormier1   2/13/2012 7:29:43 PM
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Accordiong to Cree, "The 231 was a lab/R&D result. The 162 is a commercially available product."

Larry.Cormier1
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re: Cree claims LED price-performance breakthrough
Larry.Cormier1   2/13/2012 7:37:05 PM
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I have had somewhat the same results as DrQuine with CFL failures at home. In 2 years, I have replaces maybe 1/2 dozen bulbs out of the 30 or so that I have in service. If one researches, it appears that the failures are due to the electronics associated with start-up. In order to eliminate these issues, is there any effort to start wiring houses with DC for lighting? We already have DC for doorbells. This would be an easy extension, and would eliminate the cost of the start-up circuitry, and the associated failures.

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