It should be in your ops manual. Once your into LVP's the controllers will only pass RVR's visibility won't be mentioned. When that swap over starts is airport dependant.
I have never ever heard a tower controller say RVR 550meters visibility 200meters wind variable at 2knts cleared to land. I have only been doing it for 17 years. I am just a young pup compared to Wiggy and PM.
Also there is a conversion table where you can convert visibility's into RVR's so say the airport RVR is off line and they give out a viz instead during daytime that table would convert 400meters to 400 meters at night it would convert to 600meters RVR. So daytime you wouldn't be able to go past the approach ban limiting factor and at night you would.
I can't remember the table off the top of my head I have used it 10 times in the space of 17 years never in the last 10 years But I know where it is in the manuals and what to do with it. So don't take my example as the actual factors day and night. There is runway lighting factored in as well.