luminance = (
	color,
	luminanceCoefficients = vec3( ColorManagement.getLuminanceCoefficients( new Vector3() ) )
) => dot( color, luminanceCoefficients )
Computes the luminance for the given RGB color value.

@tsl
@function
@param {Node<vec3>} color - The color value to compute the luminance for.
@param {?Node<vec3>} luminanceCoefficients - The luminance coefficients. By default predefined values of the current working color space are used.
@return {Node<vec3>} The luminance.