Replying to Crowbar Lenses

Hey,

I have some crowbars with the fire iridium lens, but i want to pick up a new pair to do some mix and matching of strap/frame/lens/outrigger, anyway I know there's the trade thread but I've failed in that so...

I've never really figured this, what are the solid like yellow lenses supposed to be good at? And if I'm buying another pair, what is the choice to go for for like the most opposite type of weather conditions - persimmon?

Sorry for being such a noob!

Cheers,

Tim