15%
JohnA Note: What can you say? This is the go to standard for much of the automobile industry. Simply the best I have ever found.
This is a little far afield from lighting but this product is such a good example of a Fresnel Best-in-Class® product that we had to carry it. This is an industry standard for a reason - it's great paint. I've even sprayed this on chrome and it's lasted for years.