What 3 wavelengths of IR light would be ideal for "Predator Vision"?

Alright, so I'm working on a setting with dwarves in it. I've been thinking that, to make things more interesting, certain clans would have the cone cells in their eyes see infrared light instead of the usual visible spectrum. However, I'm having a great deal of difficulty finding out what three IR wavelengths would be appropriate for their new primary colors. They usually live underground, but are known to be hired out on the surface for nighttime covert operations by various human factions.

So, they need to see in the 0-120F range, give or take. A wider spectrum might be more ideal though, I really don't know.

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What 3 wavelengths of IR light would be ideal for "Predator Vision"?

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