When Should Headlights Be Replaced?

Q--I saw a TV commercial for Sylvania Silverstar headlights states that headlights dim with time. It was suggested, although not expressly stated, that headlights should be replaced before they burn out. I have never seen it mentioned anywhere before that working headlights should be replaced routinely as a preventative safety measure. I know that they should both be replaced if one burns out, but not if they are both operating. What is the true story on this?

 

A--It is true that incandescent lamps grow dim over time. That’s why, when you replace a light bulb, the new one seems so much brighter. It is. You have the choice or replacing headlights routinely, but it is certainly not necessary.

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