Not quite right. What you did was 100% of the Sphere_Map *minus* 50% of reflection. This would make your reflections look like negatives.

If I take exactly your words as what you want (100% of sphere map + 50% of reflections) and you don't care about Fresnel effect, this is all you have to do.

See how I plugged the Sphere_Map into Ambient. Then I can use Ambient_Value to adjust the intensity. But you said 100%, so I used 1.

The Reflection_Value I set to .5, because you wanted to add 50% of the reflections.

I assume you are not using a true environment sphere here, surrounding the scene. Just the virtual one in the Sphere_Map (and blurred).

(Note: I had to adjust the Reflect Ray Bias because the James geometry causes artifacts.)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)