The thing about LED's is that they have almost 0 resistance , so whatever is allowed to flow through it WILL , and the problem with the stator on the blaster or banshee is the really sloppy voltage it provides along with the voltage spikes that it produces .
You really only need the following parts :
a good digital quality 12v dc rectifier and a LED load resistor/load simulator for each LED bulb . The resistors are required because the LED only needs 3-5 watts to operate , anything higher and it will cook the bulbs . The resistor allows ONLY the say maximum 5 watts through it , there by protecting the bulb. The rectifier is required to run a 12v dc bulb , and the better quality of voltage you have the more stable the voltage will be to the lights. On your second point about wanting the " Brightest " lights , generally it's NOT the bulb , but the quality of the reflector that determines the brightness .
Think of it this way if you have a dark room and you turn on a flashlight then yes you can see portions of the room at a time , if you now point that flashlight at a mirror in the room , Now you can see far more of the room with the same amount of light . There is a reason those desert racers have light housings that are as big as a large pizza , its NOT the bulb its the reflector ( shape and size ) that determines the shape of the beam and the distance it will throw that beam .