I have done an experiment with a 10W red power LED (660nm) which I have cut open partially. Only one of the LED strings still work!
I use a 12V electronic transformer. Current is 0.5A, so a 3W string gets 6W!
It is mounted on a large heatsink which turns fairly hot, about 65C. No fan.
After 24 hours, no brightness detoriation.
Connecting a regular 10W LED causes the voltage to drop slightly, so the current is only 0.7A
I have taken apart the 20W red LED lamps, because they develope too much heat. Each LED has now it's own heat sink. I use VGA coolers now, which are better for cooling! Soon I will build voltage regulators for them.
And I want to overdrive them a little, since these 660nm LEDs are not very effective. It will be some kind of experiment, if these LEDs can tolerate overdriving.
As far as I understand, the key seems to be good cooling!
All the other LEDs remain in stable condition.
I use a 12V electronic transformer. Current is 0.5A, so a 3W string gets 6W!
It is mounted on a large heatsink which turns fairly hot, about 65C. No fan.
After 24 hours, no brightness detoriation.
Connecting a regular 10W LED causes the voltage to drop slightly, so the current is only 0.7A
I have taken apart the 20W red LED lamps, because they develope too much heat. Each LED has now it's own heat sink. I use VGA coolers now, which are better for cooling! Soon I will build voltage regulators for them.
And I want to overdrive them a little, since these 660nm LEDs are not very effective. It will be some kind of experiment, if these LEDs can tolerate overdriving.
As far as I understand, the key seems to be good cooling!
All the other LEDs remain in stable condition.
Attachments
-
26.1 KB Views: 35