Oh, it's just one light.
It's the same as the normal cylinder shaped LED lights, Just (I think) better cooling due to the separate lens for each LED and the fins. I touched it after it had been on for about an hour and it was about body temp. But it was about 50 degrees out.

Redundancy. I'm a firm believer in NOT walking home. So I had a helmet mounted light (L&M viz 360+) and an old cateye in the pack. May seem like over kill, but that's redundancy for 2 bikes.

The 880 type is tiny, seems to take less space on the bar then any light I've had so far. Other then the helmet mount of course...