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The visibility needed to complete an approach is driven by geometry: at decision height the aircraft is height / tan(path angle) from the touchdown zone, and the crew must see the required visual references over that distance plus a margin. Published minima always take precedence over this estimate.
Visibility geometry
slant distance = DH (m) / tan(path angle); required visibility approx 1.15 x that distance, floor 550 m
Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.
No. Approach charts state the required RVR or visibility for each aircraft category and lighting configuration, and those values are the legal ones.
Lights extend the visual segment before the runway, so the crew acquires references sooner and a lower RVR becomes acceptable.