RE: Replace just the one or both?
Some food for thought...... depending on what headlight enclosure you have on your car.... for high intensity bulbs if you go this route....... I have read posts about the intense heat radiating off of some of those type of lights causing a too hot an environment for some plastic enclosed housings and the plastic hazing as a result of too much heat..... I cannot confirm this but I have read posts where issues resulted from some of the High intensity light bulbs....