I don't know their flash rates. I use a 25 year old Vista xenon amber flasher on the front and don't have a need for a new one yet. I combine that with a Cygolite ExpiliOn 250, a great light. I mentioned the cheaper lights because you mention spending 10 to 15 bucks for a headlight so I figured you wanted a cheaper tail light. Those web sites I gave you have other choices of lights if those are not good for your needs. Only thing I can think of is the same thing you thought of and go to You Tube and look up each light that interest you. I did that with my tail light, the Blackburn Mars 4 which beat out the Planet Bike Super Flash so I bought the Mars 4.