A staircase is usually the tightest, most enclosed box in the house — a narrow shaft that only borrows light from an entry window or a skylight above the landing, then has to bounce it down the whole flight. White solves that specific problem better than any other family. Chantilly Lace (Benjamin Moore OC-65, LRV 92) is about as bright as paint gets, reflecting nearly all the light that reaches it, which is why it shows up so often in stairwells that only get a sliver of window light from above. Mountain Peak White (Benjamin Moore 2148-70, LRV 91) does almost the same job with a soft cream base instead of a stark one, so the walls don't feel clinical under a bare stairwell fixture.
For stairs that are genuinely dim — no window on the run, just a hallway light at the top — go for the whites built to maximize reflectance. Behr White (52, LRV 88) covers a lot of ground cheaply, which matters on a staircase because you're usually painting the stairwell walls and an upstairs landing together, not one small room. Superwhite (Sherwin-Williams) and First Star (Sherwin-Williams SW 7646, LRV 69) both lean toward a cooler, more modern white that reads crisp under artificial light, which is the light a windowless staircase runs on most of the day.
If the staircase gets decent daylight already, you don't need the brightest white in the fan deck — you can afford some warmth. Navajo White (Benjamin Moore 947, LRV 78) and Silver Satin (Benjamin Moore 856, LRV 75) both keep the room feeling open without the slightly cold cast a 90-plus LRV white can have on a north-facing stairwell. Alabaster (Sherwin-Williams SW 7008) is the softer, warmer choice worth knowing if the staircase doubles as a photo gallery wall — it doesn't compete with black-and-white frames the way a stark white can.
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