Try automotive fog lights for a wide flat beam, and driving lights come in a variety of beam patterns. For mounting, a couple of squared off U bolts should do the trick.
I put lights on the ROPS of my B7100 by mounting a pedestal mount light to a piece of angle iron. Then running two bolts through the angle, one on one side of the ROPS and one on the other, allowed me to generate sufficient clamping force to keep them in place without doing anything more than scratching the paint.
Then the ROPS rust police found the missing paint.
