Rubino and Alchemia are two very good and bright Aquila strings, and both are worth a try if you want bright strings but not carbon. Both are thinner, higher in tension and brighter than nylon, but not as thin or as much tension as carbon strings. The Rubino has metal powder added to a nylgut base to increase the weight so that the trebles have a thinner diameter that makes them as dull sounding (the G in particular). The Alchemia is based on a plastic derived from sugar cane and is also thinner than nylon.
The Alchemia does have a squeaky sound when you slide your fingers along the length of the strings while changing positions. I have been playing these strings for 2 weeks now and the squeaky sound has gone away from the positions that I use the most, some squeaky sound still persists on the higher registers of the neck that I do not use as much.
Both are very good and bright string and I think that I might prefer the Alchemia slightly better than the Rubino because the sound seems to have more clarity. However, I am not sure of the clarity, because the two guitars that these strings are on, are a very different character. So I won't really know until I change strings and reverse the placement. These are the brightest strings that I have tried so far that are not carbon, and in my opinion have better overall qualities than carbon, worth a try.