I'd gotten some snowplow lights that I tried and they were OK. One nice thing about some of them is that you can actually wire them for bright and dim with the amber light on as a constant, which is nice if they're front facing. The problem I had with them is that they were huge and heavy.
I subsequently bought a set of four Caterpillar heavy equipment work lights recommended by a friend who's a Cat mechanic. I don't know the wattage but these lights are incredibly bright. I think I paid just under $100 for four of them and they are well worth the money. With just a pair of those on my ROPS I can work in the back field by the woods on an overcast moonless night and not miss a thing. Sometimes when I make a turn at the wooded end of the field, the number of
eyes I catch staring out from the darkness is a bit disconcerting, though.