If they are 55watt lights, you need 5 amps per light, so 4 lights needs a 20W fuse in it. Use a relay... If you want them switched with the main beam, then it is easy to take the relay actuator line from the main beam fuse wire in the back of the fuse box. 3 core mains cable is good for the lights, cos at the relay end you can twist all 3 cores together, and then at the light end you splt it again, giving you seperate wires to 3 of your lights, with the wires all already held in the same insulation. For the forth light I just used a little 'jump' wire from one light to the next, of course making sure that it is wired in paralell.
Hope this helps, if you want i can post a pic or 2 of my wiring for it? I made a second fuse box for the assorted electrics that i have been adding to the landy, which has all worked out pretty well.