I have a pair of VonZipper Fishbowls with a gold chrome lens, and while amazing on blue bird days, there were a couple overcast/blizzard days I rode in where I couldn't see any definition in the snow at all. So, I'm looking to buy a spare lens for overcast/blizzard days and was wondering which works better in flat light. Rose or yellow?
i vote yellow. rose will have less light transmission and contrast will not be quite as high as with the yellow. rose is more used if you want to get away with only one lens and ride normally in overcast or cloudy conditions but may need to use on bluebird days as well. Since you have the gold chrome dedicated for sunny days i would go with the yellow. I have the same lens combination for my crowbars and works great.
I'm old school, I like orange lenses for flat light. I bought a new pair last year and wore them probably 80% of the time on the hill. Only if I was sure it was 100% bluebird would I bring out the rose-coppers.
I have the feenoms and the same fire chrome lens, I agree that when the sun disappears the lens becomes useless, although I use use yellow at night I still have a hard time seeing with them at dusk. I've been looking at the rose, nightstalker blue and the smoke green for in overcast situations.