3M Scotchlite Reflective Tape, 2 feets, WHITEre4-31461
Put it on your bike and you'll never be truly invisible at night, even if you're lightless.
Put it on:
Fenders racks...crank arms fold it over adjacent spokes. On the rim between spoke nipples.
Spread it around, and you don't need a lot.
It works so, so well, and disappears until a light shines on it at night.