question about overheated LED's
- Thread starter L.E.D.
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Silviron
Flashlight Enthusiast
Re: question about overheated LED\'s
Depends on what type of LED you are asking about. Different kinds have different specifications.
Depends on what type of LED you are asking about. Different kinds have different specifications.
The_LED_Museum
*Retired*
Re: question about overheated LED\'s
Most common LEDs will be suffering & dying by the time they hit a die temperature of 85°C and stay there for awhile, though a few kinds can be taken higher.
Personally, I'd prefer to keep them below 60°C or so for a good, long, healthy life.
An ordinary 5mm LED that becomes very noticeably warm to the touch after 5 minutes (35-40°C) is probably closer to 65-70°C (or even a bit more) inside where it matters.
I don't yet know enough about Luxeons or other large junction devices to tell you what's going on in there when the outside starts to heat up; though a MCPCB temperature of around 60°C on a LS LED (unshielded/unmodified/no additional sinking) is around the upper safety limit for those.
Most common LEDs will be suffering & dying by the time they hit a die temperature of 85°C and stay there for awhile, though a few kinds can be taken higher.
Personally, I'd prefer to keep them below 60°C or so for a good, long, healthy life.
An ordinary 5mm LED that becomes very noticeably warm to the touch after 5 minutes (35-40°C) is probably closer to 65-70°C (or even a bit more) inside where it matters.
I don't yet know enough about Luxeons or other large junction devices to tell you what's going on in there when the outside starts to heat up; though a MCPCB temperature of around 60°C on a LS LED (unshielded/unmodified/no additional sinking) is around the upper safety limit for those.
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