I = current (amps)
V = volts
W = watts
I x V = w
10 x 12 = 120w
headlamps are 55w each so yes it should be ok to protect the dim dip circuit or main beam

You also need to make sure you use a fuse smaller than the cable you are using can handle ( if you only have 10A cable protect the circuit with a fuse no bigger than 10A)
( this is the only bit ive learned from my college days that ive found any use for

)