Hi,
For CAT 2 approach, strictly speaking we need 300m vis at the touch down zone ONLY, that's as per the policy.
We need to see at least 3 consecutive lights of centreline approach lights, touchdown zone lights or runway edge lights.
Each RW edge light are usually spaced out by 60m, touchdown zone lights 30m, and R/W centreline lights 15m.
As for the lights, the runway centreline lights is white/yellow, when reaches 3000ft to go, turns white and red and 1000ft to go all red.
Runway edge lights are white in color, taxiway edge lights are blue.
Taxiway centreline lights are green, with stop bar RED.
Lead in lines out of runway starts with alternate yellow and green till it becomes fully green when you are out of the runway.
Just some info off my head.
Cheers