My Owners Manual says my bulb is 60W but the lamps I received say 65W

Bulb wattage numbers are the usual way most consumers pick and compare light bulbs, but the wattage isn't as informative as it might seem. Watts are the amount of electric power input, not the amount of light output. And wattage numbers don't even necessarily indicate the actual power consumption of the bulb. Follow along and we'll explain:

The "60/55w" high/low beam rating of an H4, 9003, or HB2 bulb is found on the bulb package and in the vehicle owner's manual. It is a *nominal* rating at 12.0 volts. The U.S. Federal regulation on headlamp bulbs lists maximum allowable ratings of each headlight bulb type at 12.8 volts, while the regulation used in Europe and the rest of the world lists nominal 12v and maximum 13.2v wattage ratings. Because wattage changes depending on the voltage the bulbs are fed, all of these numbers are different. The H4 (9003, HB2) bulb specifications are as follows:

Nominal 60/55w at 12.0v Maximum 72/65w at 12.8v Maximum 75/68w at 13.2v

These three specifications all apply to the same bulb—it is not three different bulbs, it is the wattage of ONE bulb operated at three different voltages.

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