Side-mounted lights in low-light and no-light traffic stops

Something has caught my attention with the addition of the side-mounted (on mirror) warning lights to most of the patrol and traffic vehicles in my department. As officers, we are taught to disguise our approach to a stopped vehicle of a traffic offender or criminally suspicious vehicle by not allowing our cruiser doors to slam or close loudly. This is very good practice, as any person wishing to harm the approaching officer would be alerted to their approach.