I wa trying to figure out how low the average i.q. of people who posted in this thread was. It turned out my scale did not go down far enough so I am posting in order to bring it back within range.
A clear lens with no tints whatsoever would be preferable for any type of night riding. The main draw back to this is that clear lenses are really only good for night riding. With lenses for high end goggles being upwards from $40 a pop, it is not always financially sensible to get one just for night riding. Most 'low light' or 'flat light' lenses will be acceptable at night. Lenses such as Smith's sensor mirror (hands down the best low/flat light lens available), Oakley's HI intensity yellow, and Giro's gold boost, will all be useable at night. These are good options for those of us who most of the time ski during the day in foggy or snowy conditions, but occasionally ski at night. If you find that you are spending a lot of the time at the hill after dark I would recommend you get a clear lens.
I have been fortunate enough to test out most goggle and lens options, here is what I have decided on:
For reference I ski in the PNW where more often then not it is snowing, cloudy, or foggy during the day. I do not ski a ton a night but it does happen a couple times a year. I chose oakley's gold iridium for sunny / overcast days, and then use smith's sensor mirror for when it is snowing or any other darker days as well as night skiing. I don't ski after the sun goes down enough to justify getting a clear lens.