Soleil

Saturated enough that everything else in the room answers to it. Vista Paint files it as 0902.

Chroma 21.5 is high enough to dominate a room's palette rather than join it. Used across a whole room it needs restraint in the decor - furniture and textiles that stay quiet so the wall can carry the color.

In a room that gets little direct sun, this color's warmth does some of the work daylight would otherwise be doing. LRV 76.0 puts it in the middle of the scale, but saturation, not lightness, is what you will react to.

If the room already has blues and cool greys in the floor, a rug, or the furniture, this color will fight it rather than sit well beside it - the two sit at opposite ends of the color spectrum, which is exactly why they clash instead of blend.

Warm metals - brass, aged gold, unlacquered fixtures - gain a contrast against this that they do not have against a lighter wall; it is a common reason people choose a color this deep in the first place.

For a secondary wall, Dunn-Edwards First Snow gives a natural step up in brightness without feeling like a mismatch (roughly 9.7 LRV points apart). If the wall needs to be washable, eggshell is the highest sheen worth considering before the color starts looking artificial under light.

Behr Oklahoma Wheat (350E-3) matches it closely enough that no one will tell them apart on a wall. This is not a rare shade: 5 colors from other brands sit within delta-E 2 of it.

It is lighter than 80 percent of the Vista Paint range. The name is not unique: Benjamin Moore AF-330 and Dunn-Edwards DE5419 also sell a color called Soleil, and it is not the same shade. Vista Paint lists it in the C codes, alongside 1,421 other colors.