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Ordinary elements are unable to manifest in the Outer World. Due to this, it's given that light or heat of the ordinary variety couldn't possibly appear here as well.
Because of this, it's fairly common for Outposts and Outer World Camp Sites to be cold and desolate, humans can only adjust to their environment if they can't change it, after all.
If they want a simple light or heat source, they would need something beyond the ordinary. There are a few options offered by the Lifestyle Guild and they work just fine. However, due to the harsh environment of the Outer World and its unpredictable nature, these options are either unreliable at times or downright expensive for common expedition teams to afford.
There is an option to rent these items, but there is a crap ton of rules that need to be followed so it's almost not worth it.