The Vis 360+ is one of the few bike lights I've seen that is designed specifically and exclusively for helmet use. As the name implies, it's meant to provide the rider with 360° of visibility. A small headlight goes on the front, connected via a springy cord to the rear light which is integrated into the battery pack. Both the front and rear lights have amber side visibility: the front light has filtered cutouts to allow some of the main beam to come out the side, and the rear light has separate yellow LEDs on each side.
The headlight provides a wide beam, putting out 250 lumens on high. It's not much compared to many high-powered headlights these days, but is quite sufficient to provide visibility for safety, which is what this light sets out to do. It's bright enough to find your way if necessary, but I wouldn't use it as my only light. The wide angle of the headlight combined with the amber side visibility ports makes the light very noticeable from the front and sides. The rear light isn't quite as bright (L&M doesn't specify its output either), but is definitely still very visible, and has great off-axis visibility. This is important, because riders' heads can be in many different positions, and a more focused beam would be hard to see if the rider's head was turned. The side visibility LEDs on the rear are small and so dim that they're practically pointless, but fortunately the side lighting from the headlight is bright enough to make up for it.