I have added a second light to my hall. I identified that the existing light was wired to 2 switches using the Junction Box as illustrated on your web site. Before adding the second light the hall light functioned correctly and switched on and off from either switch. After adding the second light strange things are happening. With the second switch in one position the first switch turns the old light on and off but the new light remains off. If the second switch position is changed then operating the first switch turns both lights on but at a reduced brightness. Have you any ideas please?