Combination low beam/ high beam describes a vehicle that uses ONE bulb on each side, with that bulb also functioning as a low beam/ high beam bulb. Such a vehicle will have a total of two separate headlight bulbs, one left and one right.
Some vehicles come with a separate low beam/ high beam bulb on each side. Such a vehicle will have a total of four headlight bulbs, two left and two right. The advantage of having a separate low beam/ high beam bulb for each side is that if one bulb burns out, the other can still provide some light.
The disadvantage of having only one low beam/ high beam bulb on each side is that if one bulb burns out, the whole light will be lost.
If you have a vehicle with a combination low beam/ high beam headlight, it is important to check both bulbs regularly and replace them as needed. This will help ensure that you have optimal visibility while driving.
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