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Replicate the natural processes? It's literally just UV light.

UV comes in an huge variety of strengths outdoors.

There are no calculations to be a "bit off". It's just strong UV. You're making it sound a lot more complicated than it is.

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Sun also emits infrared which seems to cause positive effects counteracting some of the UV related problems.

Some cell and animal studies show that there is a slight possible effect. It hasn't been shown in humans, and even in extrapolation from animals, the protective benefit does not seem particularly significant.

Yeah. There are so many variables already. From angle to time of year to skin pigment to duration

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