Yup, it's just the smaller battery on the Micro 850. I usually run it on low or medium. It'll last long enough for my 1-2 hour nighttime rides. But it's mainly suited to commuting and errands.

The Light & Motion Rando 500 was a bit of an improvement over the Urban 500. Mostly they added some circuitry in the light or USB cord (or both) to enable simultaneously charging and running, although only at low power. I tried that a few times but it was as heavy and bulky as a larger light without the convenience.

The NiteRider Lumina Dual 1800 is terrific and a great value. It lights up rural roads edge to edge I can see deer and other critters sooner. Very helpful for my harder workout rides at night when it's cooler. Besides the dual side by side LEDs it also has a lens designed more like a motor vehicle headlight for even distribution and to aim most of the beam at the road rather than spraying light in a circle. It has a small hood like other NiteRiders, which seems to help a bit. I've watched the beam pattern carefully on a few nighttime rides on the MUP and can see the beam isn't spilling over the top into the eyes of oncoming pedestrians and cyclists.

I'm also considering adding an Outbound light to my main hybrid for errands and group rides, since I use that bike more often at night. The Outbound light has a clever design and the price has decreased a bit, despite the pandemic economic pressures and small operation (I think it's a two-person operation).