OptionalnameLinear RGB color, default [1,1,1].
Brightness in glTF physical units (candela for point/spot, lux for directional). Default 1.
Cutoff distance for point/spot lights; Infinity when unbounded (the default).
Spot inner cone half-angle in radians (full-bright); default 0.
Spot outer cone half-angle in radians (fade to zero); default PI/4.
One KHR_lights_punctual light, with spec defaults filled in. The light's placement comes from the node it is attached to (see GltfNodeInfo.light): point lights use the node's world position; directional and spot lights shine down the node's local −Z axis. Intensity is in the glTF's physical units — candela (lm/sr) for point/spot, lux (lm/m²) for directional.