I remember a long time ago about a news report concerning sunscreens. They mentioned something about the SPF rating is not really accurate and can cause more harm that good. Well that was sometime ago. But I did locate this site which seems to be the "Consumer Reports" of suncreens. You can search the database to get detailed info of the product. As well as a chart that shows which ones really work.
http://www.cosmeticsdatabase.com/spe...ns/summary.php