I found today this video what is made by Athlete Recovery Fund and talk about certificated and non-certificated helmets just watch and think about it ..
https://vimeo.com/55624399?action=share
https://vimeo.com/55624399?action=share
but honestly who fall stright on your head when you fall the impact is barley anything becasue you tuck your chin to your chest and if the force brings it out of that positon hten its just a tiny hit
It depends how you fall, man. Sometimes it happens so fast that you have literally zero reaction time.
I don't recall them saying the name of any of the helmets, just that some were certified and others weren't. And the point they were trying to get across is that certified ones are more impact resistant