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daleste
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re: Teardown slideshow: The anatomy of the LED light bulb
daleste   5/24/2012 1:27:25 AM
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I'll have to buy one to try it out. But I don't think I'll start replacing all of my bulbs with them, just too expensive.

Bert22306
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re: Teardown slideshow: The anatomy of the LED light bulb
Bert22306   5/24/2012 1:09:51 AM
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This is great. My only issue I have with the article is the notion, which I have seen expressed many times, that direct replacement of the light bulb should not be an important feature of these new LED "bulbs." And while light bulbs did not directly replace candles or kerosene lamps nets (or whatever they were called), in the same sort of luminary, the electric lamps did closely emulate their forebears. And still do. I've seen LED bulbs that do not arrange the LEDs in a plane, or at least they don't seem to. I have an LED candelabra based, for chandelier use, that emits light in all directions, every bit as much as a light bulb does, every bit as much as candles used to do in chandeliers. Not saying that new types of lamps, with permanently installed LEDs, won't ALSO exist. But let's not be so happy to turn this into a racket for lamp makers, eh? Besides which, LED electronics may fail, for whatever reason, and LEDs tend to dim with use. So easy replacement will continue to be a good idea. For the customer, at least.

Miss Mu
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re: Teardown slideshow: The anatomy of the LED light bulb
Miss Mu   5/24/2012 12:23:10 AM
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The L-Prize bulb is very nice. We tore down its precursor last year. The vertical pannels and remote phosphor are neat ideas.

Miss Mu
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re: Teardown slideshow: The anatomy of the LED light bulb
Miss Mu   5/24/2012 12:17:36 AM
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LED light bulbs are too recent to have much data on failure modes. Electrolytic caps are indeed vulnerable to heat. This light bulb has a nice space between the back of the LED emitters and the circuit card. That should help. Most failures I have seen in CFLs circuit cards were due to sub-standard assembly, not design.

old account Frank Eory
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re: Teardown slideshow: The anatomy of the LED light bulb
old account Frank Eory   5/23/2012 9:35:53 PM
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I think that which fails first depends on the design margins. One might suspect the power electronics to be the weak link. Consider that the front end of these PCBs is an AC-DC power supply with the usual electrolytic capacitors. My bet would be that those caps are the first thing to go.

chanj0
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re: Teardown slideshow: The anatomy of the LED light bulb
chanj0   5/23/2012 8:52:22 PM
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$25 each if it lasts 3-5 times more than CFL, I think it is a good deal. If heat is an issue, which piece will go away first, the power electronics or the LED? I believe it is the power electronics, isn't it?

R0ckstar
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re: Teardown slideshow: The anatomy of the LED light bulb
R0ckstar   5/23/2012 8:32:14 PM
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The 60W LED bulb has officially arrived. It's about time. I immediately ran out and got 3 of the Philips dimmables, even though they were still $25 each, just as a show of appreciation as an early adopter for this effort. The bulbs are fantastic, and kinda look like they came from the future, but I'll wait until the prices re-enter the atmosphere before I get any more.

Dave.Dykstra
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re: Teardown slideshow: The anatomy of the LED light bulb
Dave.Dykstra   5/23/2012 6:49:44 PM
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Watching this technology improve is fascinating. I find the attempt to make the bulb look very similar to the old incandescent bulb interesting. I'm not sure how much that helps sell the new bulb ( although we do, of course, need a compatible base ), but hopefully we'll see prices drop further and then see more adoption by consumers.

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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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