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A19 LED bulbs: What’s under the frosting?

7/19/2011 06:04 PM EDT
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dthayden
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re: A19 LED bulbs: What’s under the frosting?
dthayden   2/4/2013 11:00:26 PM
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The manufacturers are probably not counting on the bulbs meeting the specified life but rather replacing them in the future with cheaper to manufacture products. Or just counting on consumers to not follow up with early failure replacements, as we were trained to accept with CFL bulbs which failed to live up to the marketing claims.

elektryk321
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re: A19 LED bulbs: What’s under the frosting?
elektryk321   8/20/2012 1:28:55 PM
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I have two remarks: 1. 105*C capacitors are commonly used in PC power supplies and PC mainboards. They still die in much lower temperature than 105*C. 2. 105*C capacitors are more expensive than typical one (like 85*C). I don't think if typical LED bulb goes higher than 80*C, so why someone should use 105*C capacitors? I guess problem is not in high temperature but capacitor quality.

phlei
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re: A19 LED bulbs: What’s under the frosting?
phlei   2/3/2012 9:39:06 PM
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If you develop a PFC LED driver, you can use the deramic cap instead of the E-Cap. The E-cap life time shrinks one half for every ten degree ambient temperature. We have been designed the ACDC offline LED drivers for the LED lighting and to reduce the BOM cost. If you are interested in the products, please check out the web site. www.sqme.com.tw We design our products in the 700V process, so the 500V HV NMOS and the 700V Power MOSFET can be integrated. Please send email to Phil.Lei@sqme.com.tw to find out more. Best Regards, -Phil

Amcfarl
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re: A19 LED bulbs: What’s under the frosting?
Amcfarl   1/20/2012 9:00:43 PM
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Hi 'Liteman', I just picked up your query about my design. Yes it is still an application but has no objection raised as yet. It applies to UK, Europe and USA. If you can tell me a little more about what you'd like to know I'd be happy to help. e1aam@surfree.co.uk

elwood
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re: A19 LED bulbs: What’s under the frosting?
elwood   11/22/2011 8:10:07 PM
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Application specific Power sources! Is anyone aware of a Roadmap for power? Do the benefits of various power sources make $$ sense?

StuRat
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re: A19 LED bulbs: What’s under the frosting?
StuRat   9/20/2011 4:15:46 PM
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A concern that I don't see addressed is vibration. I have had a CFL blowout in a ceiling fan installation. I haven't seen vibration ratings for CFLs. I These board designs with the air-chassis electrolytics don't look to have reliability in a vibration environment such as a ceiling fan fixture.

liteman
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re: A19 LED bulbs: What’s under the frosting?
liteman   9/18/2011 1:13:22 PM
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Can you please tell me more about your patent, is it pending ?

Sanjib.A
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re: A19 LED bulbs: What’s under the frosting?
Sanjib.A   8/28/2011 4:50:46 AM
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I've liked this article as it has answered the same question I had: Why the LED lamps are so costly and I understand, more than electronics, the manufacturers need to do something on the heat management and the casing part to bring down the cost. Like many of my fellow readers, I am also surprised to see the claim of high lifetime with the electrolytic capacitors in it.

antiquus
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re: A19 LED bulbs: What’s under the frosting?
antiquus   8/22/2011 3:27:20 PM
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Do you think the mfg cares about 50k hour lifetimes? A 3k lifetime (1/2 year @100%) would be enough to outlast the thermal-printing on the home depot receipt.

pyeatte
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re: A19 LED bulbs: What’s under the frosting?
pyeatte   8/17/2011 4:40:35 PM
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Until light wiring and distribution is low voltage instead of 120vac, we will have these problems.

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