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What a bullshit dataless fearmongering article. If your lamp and enclosure are UL rated then the on-die temperature is well within operating parameters for the

What a bullshit dataless fearmongering article. If your lamp and enclosure are UL rated then the on-die temperature is well within operating parameters for the 6000 hr+ lifespan. If you go with a CREE or Philips lamp then their thermal design was built for the cooking the L-Prize and Energy Star demands of them. The DOE took their and customer experiences with CFL's to heart when designing goals for Energy Star LED lamps. Source: I was a lighting engineer at a major Independent Testing Laboratory for 5 years before going to software full time.

nickhalfasleep 13y ago
In short, get only Energy Star certified lamps http://www.energystar.gov/index.cfm?c=ssl.pr_why_es_com http://www.energystar.gov/index.cfm?c=ssl.pr_why_es_com To get the Energy Star rating, the manufacturer must get an independent lab to measure their operation at 45C and measure the temperature on the die (per the LED manufacturer's specs), to validate that it will maintain it's life expectancy. http://www.energystar.gov/ia/partners/manuf_res/downloads/IntegralLampsFINAL.pdf http://www.energystar.gov/ia/partners/manuf_res/downloads/In... If you want to read all the nitty gritty details.
- mcguire 13y ago
  "the manufacturer must get an independent lab to measure their operation at 45C and measure the temperature on the die" In an environment with no airflow?
  - nickhalfasleep 13y ago
    There is convection off of the bulb, but no flow from any other source. They want to make sure they can sit and take it.
    - mcguire 13y ago
      That might be a problem, if the bulb was installed in a recessed ceiling can, right? Convection would heat the environment in the fixture.
Lagged2Death 13y ago
If your lamp and enclosure are UL rated then the on-die temperature is well within operating parameters for the 6000 hr+ lifespan. 6,000 hours? Where does that come from? The L-Prize bulb claims 30K hours; most of the LED lights I've seen for sale claim lifespans in the 25K to 50K hour range. Are you saying that 6K is all we can actually expect? To actually get just 6K hours from a bulb that cost you US$30 or more (the L-Prize bulb is $70!) would be very disappointing.
- nickhalfasleep 13y ago
  Since the bulbs last so long, and it would be prohibitive to wait until a death rate of 50%, they use 6000 hours as the laboratory test time which has good correlation with information known so far from LED manufacturers. By that age they tend to be in a main sequence of life.

nickhalfasleep 13y ago

In short, get only Energy Star certified lamps http://www.energystar.gov/index.cfm?c=ssl.pr_why_es_com http://www.energystar.gov/index.cfm?c=ssl.pr_why_es_com To get the Energy Star rating, the manufacturer must get an independent lab to measure their operation at 45C and measure the temperature on the die (per the LED manufacturer's specs), to validate that it will maintain it's life expectancy. http://www.energystar.gov/ia/partners/manuf_res/downloads/IntegralLampsFINAL.pdf http://www.energystar.gov/ia/partners/manuf_res/downloads/In... If you want to read all the nitty gritty details.

mcguire 13y ago
"the manufacturer must get an independent lab to measure their operation at 45C and measure the temperature on the die" In an environment with no airflow?
- nickhalfasleep 13y ago
  There is convection off of the bulb, but no flow from any other source. They want to make sure they can sit and take it.
  - mcguire 13y ago
    That might be a problem, if the bulb was installed in a recessed ceiling can, right? Convection would heat the environment in the fixture.

Lagged2Death 13y ago

If your lamp and enclosure are UL rated then the on-die temperature is well within operating parameters for the 6000 hr+ lifespan. 6,000 hours? Where does that come from? The L-Prize bulb claims 30K hours; most of the LED lights I've seen for sale claim lifespans in the 25K to 50K hour range. Are you saying that 6K is all we can actually expect? To actually get just 6K hours from a bulb that cost you US$30 or more (the L-Prize bulb is $70!) would be very disappointing.

nickhalfasleep 13y ago
Since the bulbs last so long, and it would be prohibitive to wait until a death rate of 50%, they use 6000 hours as the laboratory test time which has good correlation with information known so far from LED manufacturers. By that age they tend to be in a main sequence of life.