I'm looking for a document or post from some time ago and it may be on TPI referencing a Dutch or German study on strobe rates. I know I've worked with a wide range of popular lights and determined that the 15-17hz range was ideal and 10hz or less wasn't as good but there was a stronger basis on it than just that. Can anyone access it? It was "Flashlight for AMIS" on TPI and the article may have been shared here as well.