i finally realised a joule thief =) , an electric system very simple to illuminate a 3v led with a 1.5v battery.
4 leds with 1.16v http://img146.imageshack.us/i/4ledphoto883.jpg/
i need to find more leds to check what is the maximum , but that's so unbeleivable to see this ,i just wandering if i can make an electric garland for chrtismas with only a simple small used battery of 1.16v.
6 leds! and still working , i'm out of leds lol .