//config.xml
<tizen:privilege name="http://tizen.org/privilege/led"/>
//main.js
  var ledFeature = tizen.systeminfo.getCapability("http://tizen.org/feature/camera.back.flash");
if(ledFeature){
	  tizen.systeminfo.getPropertyValue("CAMERA_FLASH",
    	    function (flash) {
    	        try {
    	            flash.setBrightness(1);
    	        } catch (error) {
    	            console.log("Setting flash brightness failed: " + error.message);    	        }
    	    },
    	    function (error) {
    	        console.log("Error, name: " + error.name + ", message: " + error.message);
    	    }
    	 );
	 }
else{
	alert("There is no LED Flash or broken LED Flash");
	}