well perssimon is stock on most of them and is a good cheap option for all around, but not that great for sun. For low light id say hi-yellow or maybe pink iridium. For sun, fire iridium for sure, but its not very versatile. i use black iridium most days, except when its snowing/powder. i have not used blue iridium, but have heard great things about it and someday hope to get it. I believe oakley has a chart on their site too that shows light transmission ratings and tints.