self.lightManager = [[LFLightManager alloc] init];
self.lightManager.isFront = YES;
self.lightManager.delegate = self;
[self.lightManager startTracking];

- (void)lightManager:(LFLightManager *)manager didTrackLight:(LFLight *)light {
    // do the magic here
}

this.lightManager = new LightManager(context);
this.lightManager.setIsFront(true);
this.lightManager.setLightTrackingCallback(new LightTrackingCallback() {

    @Override
    public void didTrackLight(LightBeacon beacon) {
        // do the magic here
    }

});
this.lightManager.startTracking();