In essence, somebody added glow-in-the-dark powder to the phospors in a floruescent tube. Not a bad idea, actually. I have some of this same type of strontium-based power. That stuff is BRIGHT. If you paint a business card with this stuff, it will almost give off enough glow to read by for 10 minutes or so. The stuff is still very visible 8 hours later.

However, in an emergency, carrying around a tube with mercury vapor seems like a bad idea. Flourescent tubes are not very healthy when broken.