It sounds like youre camera looks away from the light.
In the tracking.h module there are some bits to change:
Look for:

// If your camera suddenly moves away from the target once
// it finds it, you'll need to change the sign on one or
// both of these values.
#define PAN_ROTATION_SIGN_DEFAULT -1
#define TILT_ROTATION_SIGN_DEFAULT +1

Try experimenting with these.
BC