@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        zFarOverride = ic.readInt("zFarOverride", 0);
        light = (SpotLight) ic.readSavable("light", null);
        fadeInfo = (Vector2f) ic.readSavable("fadeInfo", null);
        fadeLength = ic.readFloat("fadeLength", 0f);
        init((int) shadowMapSize);

    }
Sets the light to use to cast shadows

@param light a SpotLight
jme3-core/src/main/java/com/jme3/shadow/SpotLightShadowRenderer.java