Identi tape store is great, but costs a fortune as you have to buy in bulk. Its OK if you just want one color.
What I often do is go to the automotive parts store and get the same stuff in smaller quantities. Colors are red, and the red/white stripe you see on most commercial vehicles.
That Black tape is not bright at all. I have some, but it is near worthless compared to white.
The black stuff glows about as bright as a license plate, or a bit less. The white tape is blinding compared to it.
Still, none of it does any good unless a car light is shining directly at it.