All the lights are surging brighter to dimmer when the car is at idle. This includes the headlights and all of the accessory light bulbs.
Take it to an auto parts stores and have them check the charging system. They will do it for free and you will know exactly what is wrong with it. It may be a bad alternator or battery.
You probably have a 10 year old battery (unless it has been recently changed). The charging system is trying to compensate.
this could be a result of a bad alternator unable to fully charge your battery
