How come people have 3 cones and 1 type of rod with a different peak than any cone, and yet we don't all have tetrachromacy? Shouldn't there be some level of l

How come people have 3 cones and 1 type of rod with a different peak than any cone, and yet we don't all have tetrachromacy? Shouldn't there be some level of light at which they are all active? Or is there? Are there special low light colors that can be seen in very specific conditions?