Finally got tired enough of re-compiling for light tweaking, so wrote my own light and color controlls 😋 The stored values are in Linear, but the swatches are displayed in sRGB (gamma corrected). I think it makes it more intuitive to explore the gamut this way, as the colors you pick more closely represent how they impact the scene. And the colors in the picker show how there's more gamut space taken by the lower-ends of the values.