Here is a complete product project of endtas design. Alien Light Mini is a LED headlight for bicycles. It has got two 1W leds, one with a wide angle and the other with a narrow beam angle lens.The wide lens is a bit turned towards the ground to light up nearby ahead and the other straight ahead for greater distance lighting.Visit the free product design projects website www.endtas.com for circuit schematic, hex file and other details. There are other projects too.This is a microprocessor controlled inttelligent light with 9 lighting modes.Double 5mm led flashDouble 1W leds triple flashDouble 1W leds continuous flashContinuous power 1st grade + flash/2secondsContinuous power 2nd gradeContinuous power 3rd gradeContinuous power 4th gradeContinuous power 5th gradeThe light circuit is designed to work with two Nokia cell batteries but the prototype is made by using 3AAA type batteries, generating 3.6V aprox. The product can run for days at the minimum power setting and more than 3 hours at max power.