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Feature
Electronics & Test
How Temperature Affects the Performance & Efficiency of LEDs
12/4/2013

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Figure 2. Example of luminous flux vs. junction temperature at different current settings.
Figure 2. Example of luminous flux vs. junction temperature at different current settings.

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Cabe Atwell
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Blogger
Re: Long Life
Cabe Atwell   1/20/2014 5:37:11 PM
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I recently purchased a Fenix PD35 850 lumen LED flashlight and it comes with a warning label that it becomes hot to the touch after running on full for a period of time. After that time period comes, the micro-circuitry powers it down to the next highest setting (and so on) in order to prevent damage. Good article on the subject.

Greg M. Jung
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Platinum
Long Life
Greg M. Jung   12/24/2013 5:37:03 PM
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Great discussion on the finer points of LED design considerations.  Also, in addition to price drop, in many cases LED's can also offer the advantage of longer life over the other technologies that they are replacing.

mrdon
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Gold
Re: Dealing with LED temperature
mrdon   12/22/2013 2:17:25 PM
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Rob

I agree. This Mentor Graphics LED Thermal/Performance analysis software package would have been great to use when I was developing LED lighting fixtures while working at Hunter Fan. This data would have served as a baseline while taking actual thermal and lumen measurements using an Integrating Sphere. Management of thermal and lumen performance of LEDs is quite a challenge especially when you have to add the SMPS (switching mode power supply) LED drivers heat dissipation data using a per-square inch pcb in to the overall thermal equation. Nice article! 

Rob Spiegel
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Blogger
Dealing with LED temperature
Rob Spiegel   12/4/2013 10:41:57 AM
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Nice article on the challenges of working with LED lighting and temperture variances.

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