Ditto, Outbound Lighting and similar lights, especially for off-road nighttime riding. I'm considering those myself. For a few years I've mounted two headlights on my handlebar for a broader beam so I can see rural highway road sides at night -- lots of deer and other critters. But a single light with broader beam would be better.

A single really good light also saves cockpit space for a bike computer, video camera, and my hands. I run video front and rear on every ride now. And a small bike computer with basic GPS and data. It's cramped on long climbs when I want to put my hands on the top of the drop bars near the stem.

For compact single lights, they're all pretty much the same -- basically flashlights designed for bikes. I have Light & Motion Urban 500 and Rando 500, NiteRider 750 Micro Lumina, and Serfas lights. There isn't that much difference in beam pattern. Biggest difference is in runtime per battery charge and discharge characteristics. Some lights, like the NiteRider Micro Lumina, claim a very bright maximum output but that's basically a turbo or WEP mode (for fans of WWII aerial combat SIMs). My NR 750 Lumina Micro puts out 750 lumens for only a few minutes. It drops rapidly, with a discharge arc like a softball. The L&M Urban and Rando 500 produce a more steady output and tend to fizzle out rapidly rather than slowly dimming over 60-90 minutes.

And get more light than you think you'll need. 500 lumens is plenty bright enough for most conditions. But a 1,000 lumen light will run longer at medium output than a 500 lumen light on maximum brightness. I've made that mistake trying to save a few bucks. Now I need to buy lights all over again, or limit my night rides to only an hour or 90 minutes. I tend to ride a lot at night because it's cooler in Texas summer and less traffic year 'round.