LEDs are cool! But they tend to get hot and start flickering! We usually put Heat Sinks salvaged from old computers which can do a decent job, but they are not enough for High Power LEDs. So, I tried to sandwich a peltier chip between the computer heat sink and a 100 W LED module, and it worked!
There was something very interesting which happened, as I had tried using all the 12V adapters in series at home to power the circuit (including wi-fi and few other devices, and my folks were not very happy about it! ). After getting too hot, the peltier chip was sending back-emf which was stopping the fan. The trick here is to keep the power supply for peltier, LED and fan separate.
Here is my instructable for the project!
Step 1: Stuff You Need for This
1. LED module, I used a 100W one.
2. A heatsink and fan from an old computer.
3. Peltier chip, I used one with max. power rating of 92W.
4. Thermal paste
6. Clips for putting everything together
Step 2: Prepare the Heatsink Assembly
1.Put some Thermal paste on the heatsink and apply it with a metal strip evenly.
2. Repeat the process on all the surfaces, on both sides of the peltier and the metallic side of the LED module.
3. Place the LED on top of the cold side of peltier, and hot side on the heatsink in a way that peltier is sandwiched.
Step 3: Attach the Fan to Heatsink Assembly
1. Attach the fan to this assembly by clips or any other way possible.
2. Connect it to different power sources
Since I have made one already, and I am too lazy to solder all these together. I am just lighting my old one for the demo!