Here's a pic that gives you some idea of the reflectivity of the tape. This is the tape illuminated only by a small camera flash. It's even brighter when hit with car headlights. I went with a hodgepodge, random arrangement, sticking the stuff wherever there's a place handy. In the daytime, if you're standing five feet away from the bike, you can't even tell it's there unless you already know where it is. I think I've put even more on since I took this photo.
I concentrated on getting it up high, like on my top case, handguards, etc. I put a few on the rear but didn't put any on the front. I also chose to use a lot of small pieces instead of just a few large ones. I really don't know what technique would be more effective.
I would imagine you could get it on a helmet. It's very thin, but it would probably be eaiser to go with smaller pieces that, together, comprise the same surface area as one large piece.
I had to remove some of it the other day to put on some new stickers. This stuff has excellent adhesion. I tried getting it off using the heat gun method but that didn't work. I finally had to just slide a razor blade under it and it came off that way.
With the addition of the tape on the bike and my new hi-viz reflective jacket, I figure I've done about all I can do to make others aware of my presence at night. The rest is up to me.
Here's a shot in the day time. The only place you can really see the tape is on my top box and that's just because it's not as deep a black as the plastics on the motorcycle and it has kind of a pebbled finish. Other than that, you're hard-pressed to see the tape anywhere else.
One of these nights I'm going to try to take a picture of the bike at a distance, say 100 yards or so, illuminated by my vehicle headlights to see what it looks like at that distance.