The acerbis dual light system has different angles of lamps..or is that the UFO? Anyway, one is a spot, and one is a wide angle.
Stock lighting coil will run about 45 watts.
Sure, you can rewind it yourself. Know where to get transformer wire? What guage? How many wraps? There's soldering involved (not everyone has soldering stuff).
If you DO replace the coil...make sure that you get the flywheel back on right!! If it's not tight enough, you'll eat the woodruff key..of course miles and miles from your ride home!