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I've recently built this power led for mi bike. These are the parts I used:

- Cree XM-L T6 led.  About 900 lm at 2800mA (in theory).
- 5-mode 2800 mA led driver. Switches between 10%, 50%, 100%, fast strobe and SOS.
- 70x10 mm aluminium heatsink.
- 14 degree lens.
- 20mm star PCB
- Sekisui 21 mm thermal sticker

 For the battery pack:
- 3000mAh 18650 battery
- 18650 battery holder
- old cell phone cover whith clip
 
Other parts
- switch that I found at home
- handlebar mount from old light
- 2 plastic tops
- adhesive filler
- cables that support high current
- RCA connectors

I found some ideas before building this light and a lot of information about drivers 
and leds here: http://www.forolinternasled.com/

The cost of everything is about 60 € ~ 84 $

My led came soldered on the PCB, so i started sticking the PCB to the heatsink.
Then I soldered the + and - cables from the driver on the led PCB (the PCB symbols help you)
Between the battery and the driver is a mode switch. 
I glued every part so it's water resistant and wrapped the battery pack in a bag.


<p>good day, </p><p>Nice build, do you have any specs on the length of time for the light?</p><p>Thanks!</p>
I think your description was very good. I am more curious about the heatsinks purpose, and part number so I can reproduce your great project.
Cool! But a quick question: A lot of the LED light builds I see discuss heat dissipation in one form or another. Yet, I was always led to believe that LED's run cool, unlike incandescent or halogen. Did I miss something? Or is it a relative thing (they run coolER than incandescents and halogens).
You are correct -- LED's do run much cooler than incandescent light bulbs. It comes down to the way LED's are constructed. They are more like computer chips than light bulbs. And as with computer chips, heat hinders efficiency and too much can eventually cause failure of the part.<br> <br> This is why most commercial LED's say not to put them in an enclosed fixture and why most of them involve a lot of engineering to provide good ways to radiate the heat away.<br> <br> This link is to the new 3m lights. The animation shows that the light is cool to the touch, but also shows the lengths 3m went to provide for heat dissipation. <a href="http://solutions.3m.com/wps/portal/3M/en_US/LEDAdvancedLight/Home/" rel="nofollow">http://solutions.3m.com/wps/portal/3M/en_US/LEDAdvancedLight/Home/</a>
Jeez...<br>&quot;Gosh honey, the Sun's comming up. No, wait..&quot;<br>Can' t wait to see the step- by- steps! :)
This is really cool! I also agree with etlerd, this would be AWESOME as a step by step. Let me know if you need help with that!
My problem is that I decided to post it here after I had everything finished :S.<br>I'll try to draw something for the steps with some pictures of each part.
Ive been seeing a lot of these one-step instructables. If you want to make a good instructable, best to break construction down into manageable steps, using lots of pictures with explanations for each step, mentioning how you used each part mentioned in your parts list, etc.

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