How low, exactly?
Is it "I thought up a few ideas, but I'll choose the one I find more entertaining rather than the one I think is likeliest to succeed" low?
Is it "I have only ideas that seem sort of smart to me coming to mind, so I'd better not act on any of them in character" low?
Is it some other quantification of "low", rather than just "lower than a higher score would be" which is an entirely different thing?
Please quote a source found in the 5th edition rule set that indicates to you which "low" is the right one, and cannot be equally supportive to the idea that every score in the entire possible range is roughly equivalent to whatever the players' capabilities actually are (for clarity: meaning anything from 1 to 30 in my character's Intelligence score makes my character roughly as intelligent as I am).