I don’t know because I don’t have one. But usually why people Lucy ball pythons underneath the light is to reveal the hidden pattern of other co-dominant genes. And that it is really cool.
So if you have a Lucy Texas rat snake, stick it underneath some black light and take a picture for all of us.
I have a rescue one ill have to try it with, they have a random red scale that i thought was a mite when i first got them, so somethings going on, would be cool!