Greetings, reviving an older post here. Thanks K'Tesh for starting this thread - great idea and very pro looking results on your bikes! I've been looking around for add'l info about grading the reflectivity and found a good sign site if anyone's interested:
Manual of Traffic Signs - Sign Sheetings
You may have already seen it as I later discovered it to be sub-linked in the the sign blog K'Tesh mentioned earlier in this post. I may have just missed it, but I didn't really see a simple answer for what types are best for bikes and gear and what's good for apparel. From the trafficsign site info, I would say if you can find products with ASTM classifications, go with type IV and type VI, respectively.
I haven't "made my bike glow down the road" yet, but will come back and post pics once I have.
Thanks for all the tips everyone, and lot's of nice looking bikes!