What if you replaced all cones with rods?

[Ottriman]

This is about vision, I am writing a novel and might also use this for a game at some point.

A character has a power that lets her transform her eyes to replace all the cones with more rods to sacrifice color vision in favor of night vision. We'll assume no neurology problems or anything from this.

1) How many levels of the Night Vision advantage would that be?

2) If she also added the eye-mirror thing into her eyes that a cat has, how would that affect things. Again we assume no compatability issues.

3) How would you stat this? Something like Night Vision X (Switchable, temporary disad: colorblindness) right?

Edit: 4) What would this look like?