I have a pair of Bolle shiny black that start clear and get to about 50% - that's my go-to set of dusk or dawn specs. My Oakleys came with a pair of light orange lenses (can't remember what they call them) that I'll use when I start at dawn and it's overcast. They're tolerable at night but obviously clear is better.
Transitional lenses don't necessarily start at 100% light transmission though, so pay attention if you go that route. Some transition from pretty dark to Ray Charles dark, which is not what you're looking for.