What hides between Shadow and Light?

[mmammel]

Hmm... well. The missing numbers in the sequences...

The missing numbers here would 5 and 15 as previoulsy noted. Making the full series look like this:

I suggest that the next numbers in the series would 6 and 8, cause then all columns total to 44.

And now I´ll go to bed...

You only need one number from each sequence. I did not really solve the second one, just used trial and error to find the second seed.