Do LED fixtures throttle to limit temperature?

[Electric-Light]

CREE, the LED manufacturer offers LED troffer system with a claim of 110 initial lumens per watt.

The performance depreciation is the greatest during the first 6,000 hrs. One of the things in their claim is "An innovative thermal management system boosting LED lifetime, efficacy and color consistency"

cited from:
http://www.led-professional.com/pro...hortened-payback-time-for-commercial-lighting

One thing about LED is that efficacy is reduced with increasing temperature and decay is greatly accelerated with higher ambient(encapsulation degradation) as well as high heat sink temperature(chip degradation).

Some computer CPUs will clock-down in order to avoid system crash when high ambient or dust accumulation causes over-heating and this is of course, at the expense of performance. So, I have to wonder... do LED lighting manufacturers "thermal management" mean "throttling down at the expense of output" ?

 

[gndrod]

Nuventrix

Nuventrix

CREE, the LED manufacturer offers LED troffer system with a claim of 110 initial lumens per watt.

The performance depreciation is the greatest during the first 6,000 hrs. One of the things in their claim is "An innovative thermal management system boosting LED lifetime, efficacy and color consistency"

cited from:
http://www.led-professional.com/pro...hortened-payback-time-for-commercial-lighting

One thing about LED is that efficacy is reduced with increasing temperature and decay is greatly accelerated with higher ambient(encapsulation degradation) as well as high heat sink temperature(chip degradation).

Some computer CPUs will clock-down in order to avoid system crash when high ambient or dust accumulation causes over-heating and this is of course, at the expense of performance. So, I have to wonder... do LED lighting manufacturers "thermal management" mean "throttling down at the expense of output" ?

After reading the referenced article, notice how careful the mention of using a T8 as the comparison to the Cree troffer output. A T5 overall would have been superior to the CR LED troffer claim. There is no mention of the cross-patent sharing of the Seoul Semiconductor LED that tests as high as 240 lumen for each Diode output and the temperature control compensation to maintain less degradation.

The further link to Nuventrix, Inc mentions a proprietary driver temperature reduction using discrete components integrated into a smaller IC that dissipates heat for more efficient thermal management. A lower 'dimmer' voltage component cycling for each array may be the thermal management is my guess.

 

[Electric-Light]

notice how careful the mention of using a T8 as the comparison to the Cree troffer output. A T5 overall would have been superior to the CR LED troffer claim.

There isn't really any difference in performance between T5 and T8. T5 is 5/8" in diameter, T8 is 1". That's about it.