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Teardown slideshow: The anatomy of the LED light bulb

5/23/2012 06:16 PM EDT
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RickBunn
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re: Teardown slideshow: The anatomy of the LED light bulb
RickBunn   5/24/2012 1:57:59 PM
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Good stuff. The CFLs are great because they produce more light then heat -efficiency! The LEDs will produce heat but seam to have the efficiency. I found it easy to replace all of my incandesent lights with CFLs and only wish they were US made. I will try a few of the LEDs as the CFL's fail. New formats like overhead lighting or panels may come with time. Remember tube circuits and how the tubes were replaceable and now we had solid state and we no longer expect to replace active circuits.

IFTLE
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re: Teardown slideshow: The anatomy of the LED light bulb
IFTLE   5/24/2012 2:48:32 PM
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How about we all stop using science to drive polotical agenda. This technology is wonderful, but the promises of savings to the consumer are absolute BS. see: http://www.electroiq.com/blogs/insights_from_leading_edge/2012/04/iftle-98-lester-the-lightbulb-vs-cfl-and-led-the-saga-continues.html

Patk0317
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re: Teardown slideshow: The anatomy of the LED light bulb
Patk0317   5/24/2012 3:47:40 PM
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New construction should make good use of this technology. With LED lighting you can do color mixing where you can change the mood of the room for reading, watching a movie, listening to music etc.

R0ckstar
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re: Teardown slideshow: The anatomy of the LED light bulb
R0ckstar   5/24/2012 4:53:47 PM
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If electrolytic caps are present in both bulb types, then they're going to be the common weak link, In which case I suspect we will find they both end up lasting exactly the same amount of time.

old account Frank Eory
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re: Teardown slideshow: The anatomy of the LED light bulb
old account Frank Eory   5/24/2012 5:21:25 PM
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If LED bulbs really last as long as is claimed, then they're actually not more expensive in time-averaged price than CCFLs. A few years ago, I replaced all my incandescents with CCFLs, all of which claim to have 10,000 hours life. At first I bought brand name expensive ones, but after replacing a few of those after just a year or so, I started buying the cheap no-brand made in China CCFLs, which are now only $2-$3 each. They seem to also only last a year or so, which is no worse than the expensive ones. The no-brand LED bulbs seem to go for about $20 for a 60W equivalent light output, and they claim 25,000 hours life. It all comes down to the claim vs. the reality.

vandamme0
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re: Teardown slideshow: The anatomy of the LED light bulb
vandamme0   5/24/2012 7:10:42 PM
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The quoted lifetimes are PREDICTED reliability based on specific temperatures, perfect construction with no flaws, and no temperature cycling. The usual bathtub curve applies: some will fail very soon (infant mortality) due to poor construction.

vandamme0
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re: Teardown slideshow: The anatomy of the LED light bulb
vandamme0   5/24/2012 7:50:15 PM
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The controller is actually an Infineon ICE1HS01G. You made a great effort to tear apart the LED, but how about a schematic of the board?

Miss Mu
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re: Teardown slideshow: The anatomy of the LED light bulb
Miss Mu   5/24/2012 7:58:50 PM
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It is not Infineon, we tought so at first, but we decaped the part and found on ON Semi die inside. We could do the board as a follow up. Stay tuned.

pixies
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re: Teardown slideshow: The anatomy of the LED light bulb
pixies   5/24/2012 8:23:45 PM
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If the power electronics is the weakest point, does it make sense for each household to have a low voltage DC circuit? Most consumer electronics only need low voltage DC power source anyway. That will be more energy efficient and save a lot of copper. NSF has a model house where there are USB wall plugs.

Bert22306
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re: Teardown slideshow: The anatomy of the LED light bulb
Bert22306   5/24/2012 8:29:07 PM
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In my experience with CFLs, lifetime is much, much longer than with incandescent bulbs, although I don't use CFLs in the refrigerator or in the oven. I've found that in fixtures where incandescent bulbs were very short-lived, i.e. two lamps in particular, CFLs also fail sooner than normal, for whatever reason. But my sample size is too small to say that for sure yet. And in this involves CFLs with the small candelabra base, which most likely means that cooling of the electronics is inadequate. (I've changed the socket of one lamp to regular Edison, but still have some candelabra-to-Edison CFLs, with adpater, to use up. And these adapters look terrible for heat dissipation.) In fixtures that use the regular Edison base, 60W or 40W equivalent CFLs, they soldier on for many years. Way longer than incandescents. I'm sure that in time, the failure modes will be taken into consideration. Also, for oven or refrigerator use, it seems really trivial to use glass fibers to bring the light into the unfriendly environments, and locate the light source where the climate is more temperate. Otherwise, you're looking at hardening like for automobile engine electronics.

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