public Light myLight;
    public float timeActive;
    bool active;

	// Use this for initialization
	void Start () {

        active = true;
        timeActive = 2f;

    }
	
	// Update is called once per frame
	void Update () {

        timeActive -= Time.deltaTime;

        if(timeActive <= 0)
        {
            active = !active;
            timeActive = 2f;
            myLight.enabled = active;
        }

	}