Real - Time lighting via 18% grey sphere

Hello,
I'm from the Visual Effects side of things so I am hoping you can cover (or uncover) how to extract lighting information from a Grey sphere in Real - Time :
It does not have to be very accurate.

I am developing for Microsoft's Hololens.
https://www.microsoft.com/microsoft-hololens/en-us

It would be terrific if I could sample the lighting from a real environment (via a Reflection and a grey probe) to be able to integrate CG objects better into their surroundings.

Have a read of the excellent article from the makers of Unreal Engine to understand how Light & reflections are captured for use in VFX & Game engines:
https://www.unrealengine.com/blog/updated-lighting-in-templates

Can you create a script / algorithm that can :
1. capture diffuse lighting and direction from a grey matte finish sphere in real time.
2. It does not have to be accurate. Any progress via automation is a win for the Mixed Reality industry.

Do let me know If I have not been very clear in explaining what I'm going after.
Cheers,
behram

No project files, tests, or entry points are mentioned. Start by reading the linked Unreal Engine lighting article and the HoloLens context, then define how a real-time script or algorithm would capture diffuse lighting and direction from an 18% grey sphere; done means producing a working, approximate automated approach.

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