Hi,

Is it possible to use a value for light contributions (in a light object) in place of a boolean?
For example if we want a light to produce its full specular power but half of its diffuse power we would set diffuse light contribution at 0.5
(As it exists in Arnold where each light can set its contribution as a float value)

Regards,
Francis

Not at this time. In place of that feature, you can duplicate the light, assigning mutually exclusive contributions to each, i.e. -reflect on first, and -!reflect on second. Then you can adjust the light intensity of the lights individually. Not as simple as a slider, but you can achieve the same end result.