personally i prefer the round 6" to 4" over the rectanglar one's I have four 6" KC Daylighters mounted on my '89 cherokee two on the front bumper and two on a gutter mount light bar the daylighters are great come in 1mil. and 2mil. candlepowers but can't be used on the road so i also have two 4" round halogens mounted on the front bumper inside of the KC's,they are 15-55w driving lights and they are legal for on road use plus are just as bright as headlamps but have a focused beam that cuts through fog as well. then you can't beat that they look great and give your rig that extreme off-road look.