I happened to be on the Rays website this evening, and found an interesting link:
http://www.rayswheels.co.jp/catalog/201110forginge. Rays has put out an interesting brochure that explains parts of their manufacturing process, and their own extension to JWL testing which they call +R (also known as JWL+R).
It's cool to see how some manufacturers don't just try to meet safety certifications, they push safety even further.