Понял. Залинкуй поверхность с теми источниками, которые должны бликовать.
ниже экстракт из Mastering Maya:
When a light shines on a surface, they are said to be linked. All the lights have a setting called Illuminates by Default, which is turned on by default and makes the light shine on all objects, which means the light is linked to all the objects in the scene. If the setting is off, the light will not shine on any object unless you manually link it to that object. You can also do the opposite and cut the link
between individual objects and a light, in which case the light will not shine on those individual objects. If you are working on simple scenes, you will usually leave things at default settings and let all lights shine on all objects. As soon as the scene gets fairly complex, however, you would want to start linking lights only to the objects they need to light, as linking affects rendering time significantly.