How would one go about having a LightMeter and ColorMeter inside H?

So I'd like to have something like a small sphere that would read out light values at the spot where it's placed. Basically a cg version of a real LightMeter & ColorMeter

I don't even know where to start. Is there something build in or maybe another way to get color & intensity data at specific points?

Thanks

PS: False color would be nice too I've gone over this tread, but I could not find an example that replicates false color accurately https://www.sidefx.com/forum/topic/26767/ [www.sidefx.com] . what I mean by that is that you must have control of the IRE values and know the (false) color chart gamut.