Irradiance Volume not working

Hi Guys, I am brand new to eevee. I want to add some overall lighting to my scene, in addition to a spotlight.

The cylinder is my backdrop, and I will be shooting my object inside the cylinder.
Here is where I have applied 2 simple materials and an irradiance volume in the material preview tab:

And this is in the rendered viewport, the only way I can see anything after baking is to push the irradiance volume intensity way up, which is not the right thing.

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Took me way too long to work this one out!
It’s a light probe, not a light source. All it can do is work with the information (lighting) that you already give it…