The Trucklite LED lights may be the ticket.
I just installed a set in my 712W; while they are bright and well focused, I don't think they create as much light as the 70W H4s that I replaced. The original lights did not focus as tightly, so there was light spill all around the intense light areas. Now with the very focused LEDs there is very little light spill outside of the intended area, so they seem darker. Even the high beams seem somewhat darker, but effective.
I haven't done much night driving since I installed them and got them aimed, so I can't really say whether I like them better or not yet. They certainly are more efficient and more dependable but I have heard that the polycarbonate lense won't last as long as the glass envelope (stone hits ignored). Mostly, they're just different than what I've had.
FYI, I found a pair on Ebay for just under $200, shipping included. They came with black headlight buckets that would be used on Duce and a halfs, for example. White wire was ground, Red was low beams, Blue was high beams.
Jim M.
712W and 710M