finished ceiling 20' high, recessed lights

Residential fixtures won't work well at 20'. I suspect you'll need commercial fixtures rather than residential. This is something I would model in a photometric program like AGI32 or Visual. You can contact the local rep agency for one of the major the lighting brands and they should be able to help. Your supply house should be able to put you in touch with the agency for brands that the supply house carries.
 
You could look at this thread:

High lumen recessed

Hey guys, I have a lab I need to provide and install lighting for. Owner wants recessed. We typically install about 85-90 lumens per SQ foot for these spaces. The framing is 16" OC, so I am looking at maybe an 80" pattern which puts me at 3500-4000 lumens per fixture. I'm not dead set on...
forums.mikeholt.com


Note the fixtures changed several times and the ones I finally installed are in post number 13, I really like them, lots of lumens.
 
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