Today I gonna show you an interesting project - retro bicycle self cooling 3W power Led headlight!
Last season, my old lamp headlight had bad durability, non-energy saver and bad brightness :(
This season I have made a new one - here's an intructuble to my Led headlight
2-3 Lithium-ion rechargeable batteries (standart 18650 - 3.7-4.1 Volts 2000-2350 mAh)
One 3W Led driver. (Input = 8 -12V DC Output = 3 - 13.5v DC, 700mA)
One White Lumiled Luxeon Star 3W LED.
One lens for the Led with 8 or 12 degrees
old CPU heatsink (around 6cm x 4cm x 3cm) and 1.2 inch cooler (0.03A or something about that)
1 large toggle switch (two or three positions)
Some silicone or epoxy
thermal compound (also known as thermal grease or heatsink compound)
plastic or fiberglass for heatsink mount
old headlight for bicycle
Coffee tin can with onenind top for batteries and switches
some coaxial wires (2, 3, or even 4 small wires inside from PC)
Because I had used more complicated system for headlights and rear side + stop lights you might misunderstand some steps
It will be enough 2 Li-ion batteries ad single-position toggle switch...
Also you may use another Led driver - TR-0021B inpulse led driver 4 - 18V with direct drive
As a battery charger, I've used an old RC helicopter Li-Po charger (3.9-4.1V 900mA) EK2-0851 - E-SKY Balance Charger with Mains Adaptor 7.4v/11.1v with Auto cut-off with LED indicator