Bright, highly saturated colours often associated with movement and stimulation.
Red
red · medium
Orange
orange · medium
Hot Pink
pink · light
Lime Green
green · medium
Amber
orange · medium
Tomato
red · medium
These are held together by depth rather than hue. Every one of them falls between L*53 and L*81 — mid — across 4 hue families (red, orange, pink and green). The consistent lightness is what makes them combine without argument; the hues are free to differ.
They are not interchangeable. Chroma runs from 65 to 105 and lightness from L*53 to L*81, which is a wide enough saturation spread that the strongest of these will dominate the quietest if you use them at the same scale. Pick one to lead. They also split on undertone (warm, neutral and cool), so pairing across that split is where this group most often goes wrong.
Assessed individually, most of this group comes out strong for accents and small objects. That is a property of the measurements rather than of the mood label — a colour does not become easier to use on a wall because it is described as highly saturated.
At an average chroma of 84 these hold their identity under most lighting — the risk runs the other way. Warm evening light on an already-saturated warm colour can tip it from rich into strident, and these are exactly the colours that look different at 8pm than they did at noon.
The grouping itself is an editorial judgement — a mood is a convention, not a measured property of a wavelength. Everything said about the colours in it above is derived from their measured values. See methodology.
See also: interiors and accessibility guidance for using these colours.