Today I researched IR systems and how they work.
This video explains how various forms of "invisible light" can be beneficial given the correct equipment:
I also found this brochure for the FLIR Quark
After doing a bit of research on some RC forums, it appears that the Quark MSRP is around $4000, and the Tau MSRP is around $3300.
Here is a video of a drone flying FPV at night with a FLIR sensor:
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