Sunnyside

Strong enough that it sets the palette for the room, not the other way around. 0842 in the Vista Paint range.

Chroma 78.4 is high enough that the color will bounce onto light surfaces, so expect it everywhere, not only on the wall. In a room with plenty of natural light, this can cover more wall area than it could in a dim one, where the same color reads heavier.

The yellow is more noticeable under cool, daylight-balanced bulbs than under standard warm ones, which tend to mute it. LRV 67.0 tells you how much light comes back, which matters less here than how much color comes with it.

Depending on the bulb, this can genuinely read as yellow or as orange - it sits right on the border between the two, only 4° apart. Worth checking before committing to a full wall: blues and cool greys nearby - in a floor, a rug, a piece of furniture - will read as a clash here, not a complement, since the two colors sit at opposite ends of the spectrum.

Anything pale placed against this wall will look paler than it is; anything warm-metal will look warmer. Neither is an illusion the color plays deliberately - it is simple contrast, but worth planning rather than discovering.

Matte suits a color this strong - a glossier sheen would turn every light source in the room into a visible hotspot on the wall.

PPG Flirtatious (1212-7) runs close enough - delta-E 2.64 - that swapping brands should not change how the room looks. No other brand has a color within delta-E 2 of this one - a genuinely uncommon shade.

It is lighter than 69 percent of the Vista Paint range. Among yellows it is one of the strongest: only 1 percent of them carry more colour. Vista Paint lists it in the C codes, alongside 1,421 other colors.