Constant SURFACE_LIGHT 

pub const SURFACE_LIGHT: Tone;

The light a surface catches: the specular sheen across a glass body and the rim lit along its edge (crate::tokens::Colors::light, read by the Glass painter set).

Daylight, at no chroma: light is not a shade of what it lands on, so a theme’s or a workspace’s temperature never tints it, and it is white on every polarity. High contrast says white too: its surfaces carry no finish, so nothing paints it. How strongly a surface catches it is the theme’s, in the role’s finish (specular, edge_highlight).