It's still working. A new harley high powered led tail light is still shining bright after a year in use.
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Thermal study on high powered leds
Onshape model designed many years ago:
The housing is an EOS 3D printed nylon part. Is this crazy? 9 watts inside this little plastic shell would melt and then catch on fire if you haven't developed the proper thermal design.
Below is a thermal image of the led with the leds in running mode which is about 6 volts & .1 amp:
Above you can see the 3 leds producing heat and creating 125F. This is the running light that's on all the time and doesn't create much heat when you're riding around. The red object below is the rear tire and is equally hot because I just returned from a long ride.
I'm currently working on a thermal write-up for those of you interested in adding high powered leds to a bike. I'll attach it here in a couple of days when it's complete. It's interesting when you step on the brakes and apply 9 volts to the LED.