Rigid industries D1
I agree with the above post but I intalled the D1 (first generation) LEDs from Rigid and think they are great. The yellow 'lens' is easily added and I run one on the right and none on the left to provide a different kind of picture for oncoming traffic.
Lightforce makes some awesome lights, in 4 inch or perhaps 3.5 inch and six or seven inch. They can be rotated to move from flood to spot depending on driving conditions and can be equiped with different color covers for fog/other applications. There are really well made, rugged and very reasonably priced. And they are from Oz.
I run both Lightforce and Rigid D1s on my R1200GS in addition to an HID low beam and a modulated high beam. I run a yellow lens on the left lightforce and a yellow lens on the right Rigid LED. There is no question that more drivers see me coming and that is part of what the lights are there for.