The phrase "bright yellows" refers to shades of yellow that are vivid and intense, rather than dull or muted. It indicates a strong, vibrant form of the color yellow. Full definition
I wanted to bring in color with bright yellow accessories & wore high heel neutral sandals (very similar to this pair) to create a longer leg line. (theboxqueen.com)
This chain is a very bright yellow color and really stands out on your neck. (geekwrapped.com)