Light yellowing leaves

You look to be suffering from a little to much light intensity to fast. I would raise the light back up to where it was last week. The plant is still want to grow while it’s starting to transition into flower. So if you haven’t increased your Cal-Mag I would go ahead and bump it up a tad. The plant will yellow slightly on the tops as well during its transition naturally. It tries its best to grow leafs fast feeling the pressure to flower. Just another way to tell you she’s getting hungry and eating what your giving lol. Happy Growing!