Wednesday, December 12, 2012

LED lighting

An global warming & energy-conscious colleague gifted me and others a Philips EnduraLED light bulb each, and my initial impression is very positive.

You can read more about it here.
(Please note: ordering from that page is restricted to New Jersey.)
Posted by Arun at 11:14 AM

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vparrikar 0p · 642 weeks ago

3 years ago I had purchased all our CFL bulbs from this site. I see that while the energy drawn by the CFL and LED bulb is comparable, the latter contains no mercury.
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Thomas Pindelski · 642 weeks ago

The warranty is only 3 years (26,280 hjours of non-stop use), whereas the claimed 25,000 hour life would translate to 14+ years if used 5 hours a day, which is more realistic. This suggests either poor resistance to on-off cycles or lies by the manufacturer.
3 replies · active 642 weeks ago
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Arun · 642 weeks ago

These devices have been designed and put together relatively recently. The lifetime has not been established by testing under normal conditions - there just hasn't been the time for these bulbs to live out their natural life.

My understanding is that accelerated testing is done, at elevated temperatures, and perhaps higher currents and voltages than normal. The 25K hours lifetime is an estimate based on such tests.
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Arun · 642 weeks ago

The bathtub curve illustrates the failure rate of components. http://www.weibull.com/hotwire/issue21/hottopics2...

The manufacturer's warranty, as far as I know, is intended to take care of the infant mortality phase of the life cycle.
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Arun · 642 weeks ago

The worthlessness of extended warranties, explained in terms of the bathtub curve. http://voices.yahoo.com/are-extended-warranties-w...

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