I mounted my Hella 700FF on top of the bumper of my '00 XJ. Make sure "TOP" on the lense is UP. I also installed 100 watt bulbs, so far no melting!! Like many have said, USE A RELAY!!.
I interconnected mine to the high beam circuit so the Hellas only come on when my high beams are on. My XJ is not an offroad vehicle, but I drive on lots of back, rural, 55 mph roads, without street lights, lots of deer & moose, oh my!!!
If your using the Hella green on-off switch it is way too brite and will blind you. I mounted my Hella switch on the center console, above the emerg. brake handle and below the cover's latch. It's facing forward and is easy to reach, since my right arm is often resting on the console.
Fran