In this case I built a flashlight with a 50W 3V LED
I get the LED recicling a damaged LED 50W 36V. To convert the LED from 36V to 3V is here.
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Step 1: Mounting the LED
First get parts: An aluminum heat sink, dissipating cream and an old flashlight.
I installed the LED by drilling holes on the heat sink, put some dissipating cream and fasten with screws. I made other holes for the wires.
Step 2: Installing the Battery Positive Contact
Solder a spring on a perforated plate project, then I soldered a pins that will support the contact.
I cut the plate and subjected to pressure in the heat sink, then soldered the red wire. This wire go to the +
Step 3: Installing the Base of the Flashlight
I used an old flashligt base and cut It to fit in the guides of heat sink. I made a hole to pass the black wire.
As the chassis lamp is aluminum is enough that the cable do contact to close the circuit.
I added a bit of superglue to secure the base.
Step 4: Using My New Flashlight
As you can see, the flashlight lights up pretty well. I used a 3.7V 2000 mA rechargeable battery.
It stays on approximately 1 hour more less ;)