Wouldn't X-y make them think you're farther away than just a single light?
The problem is with a single light there is not way to judge distance at all. Most will judge your single light farther away than you really are.
MSF research show a single low beam with driving lights is the best AFTER a car.. but still they judged the "safe distance" 35 feet closer for the motorcycle than the car.
LAST was a modulating low beam.. the safe distance judged for it was 20 feet CLOSER than the driving lights and closer than a single normal low beam, and almost 60 feet closer than a car.
In other words, they thought it safe to pull out in front of a car going 45 MPH at 311 feet, but a bike with driving lights 275 feet, and a bike with a modulating headlight.. they only gave them 250 feet.
BUT that's only ONE scenario and doesn't really answer the conspicuity question.. When someone at the front of the pack comes back to ask me what kind of lights I have.. "Because every time I looked in my rearviews you stuck out of the pack. I ALWAYS knew where you were!" THAT answered the question for me. I don't depend on it, but I like to think that I'm more conspicuos than everyone around me. If someone is approaching me from an oncoming lane, or if I'm coming up behind them I have a MUCH better chance of not just being seen at all, but being seen much further down the road.