Are you referring to fluorescents as being brighter? Fluorescent colors need uv from the natural light to show up well and after the sun has set these colors settle down rapidly unless its very clear and the moon is near full and up.
I know on my crappies bites that using dark baits [purple is my pet dark color] very early in the morning works well until around 10 and then I switch of a brighter color, generally a bright blue, or I go to clear baits with lots of glitter. I sometimes have to play the color game depending on whether we have sun or overcast. Late in the day when the sun casts long shadows I’ll be back to my pet purple as a dark color and will fish that until its too dark to see.
I think most anglers using plastic use baits that stand out or contrast against current water conditions and clarity simply because fish are able to see the plastic or head color against the water color. If a person is fishing as super low light period, using solid black can help turn the tide for them because there is nothing in a natural environment at fishing depths that’s a dark as the black used to make baits. Black will stand out against the water better than those light, bright colors and is what helps make the color visible to fish.
Two things I will note here….
First: I do not fish any color of a bait as a stand alone color. Any bait I fish will have a chartreuse tail and some may have hot pink or fluorescent orange instead of chartreuse, it just depends on the bite and the day. When people ask what my favorite color is I simply say “anything with a chartreuse tail”.
Second: Since I make my own baits I make every single batch of plastic using UV enhancer in it. It’s invisible to out eyes for the most part but fishes’ eyes are sensitive to it and even in very murky water with just some moonlight on it the fish can detect the baits containing small amounts of the enhancer. Since the enhancer is mixed thru the entire bait and at the bait’s surface even if the bait gets broke off the enhancer will be present at the break. UV enhancer has been a game changer for me over the last 6 or 7 years.