I know it's OK with my 35W HID's.
P=IxE 35w / 12V = 2.91A
Not sure if your trying to save power, or create more light.
the cheep 35W hid's really work great. I bought VVME.com.
If your trying to save power, realize the stator produces 100% output all the time, what you don't use is shunted to ground through the voltage regulator.
2015 KTM 690 Enduro R
2014 R1200GS - My Naked Street Touring Bike
2000 KTM LC4 640 E - currently up for adoption with 3200 miles