Tadgear makes a white cord that glows in the dark. It is not 550 strength but excellent for lanyards, etc. I had left some out in the house and found that it glows a long time after being exposed to sunlight coming through the windows and then to electric lights before retiring.

http://www.tadgear.com/x-treme%20gear/accessories%20main/glow_in_the_dark_cord.htm

JC: Do you have a link for the high-visibility yellow paracord with the 3M reflective threads?