Solution of led supply by battery

The led supply is diversified and stable, which includes the support for battery . the application is so wide such as: signal lights, emergency lights, headlights, uv led strip , flashlights and solar street lights , which has been successfully applied in Lighting field .LED gradually took over from Incandescent lamp, fluorescent lamp, xenon lamp.
Now more drive the LED by constant current source method. but today we share that a way of drive led by LM317, please see circuit pic as follows: