You'll want to ask for more information before ordering.
The page seems to imply that it can require up to 91W. They state 91W, 40.5W power consumption, and 13x 7W LEDs (adds up to 91W).
Their photos show three different illumination modes, one of which does show 13 LEDs lit up at once. While they do state how many lumens each mode produces, they don't state the power consumption for each mode.
If it does only ever consume a maximum of 40.5W at once then you might be looking at a great option.
Maybe someone else can address other possible issues. I've seen it said many times that cars have different beam patterns than bikes but I don't think that'd be a deal breaker.
You would have to figure out a custom mounting system. Either to mount it into the stock bucket or remove the bucket, hide the wiring connections, and mount the light without a bucket.
EDIT: Their examples show the low beam and high beam both pointing directly ahead, with no change of angle, only brightness. Blinding oncoming traffic might be a safety hazard.