More than likely the light was rated at 240w with voltages from 9-32 vdc. 240/32 - 7.5 amp or so. At least this is how my Nilite 42" light bar came out. It would blow a 5 amp fuse, but not a 10 amp. The fact that they use 18 ga wires is also a clue that it's no where near 240 watts at 13.2 vdc.