I have a set of the KC Slimlite 'driving pattern' lamps, which are rated at 100 Watts according to the website. Even the fogs say they are 100 Watt. So the short answer is no, there are no lights rated at 55W or less.
And no, I would never advise using them on the street, at least not in traffic. What you do on a secluded country road is pretty much up to you, but if you shined a set in my face I'd probably hunt you down! Just don't be a ****, don't do it..
That being said, aiming the lights has a lot to do w/ it too. If the diffrenece I've seen between the 'long range' pattern and the driving pattern I have is any indication, the fogs are focused pretty short and pretty low. So you'd probably be able to set them up so they weren't such a nusance, almost like stock Ranger fogs. .. But I wouldn't do it. Why do you really need the additional light in traffic?
..Which brings me to my rant for the evening: What the hell is up w/ the driving w/ the high-beams on while on the highway lately?! My GF lives about 30 miles from here. I drove down to see her tonight after work. I passed two jokers tonight who just HAD to have their brights on while in thick traffic on the highway! I contemplated letting them pass me again and trying to flip my beams at them, in case they just didn't realize it or something.. But man was I heated!