No, more acuratelly, none of the commands made the screen show a black background with a glow, which I believe is what you mean by "blacklight".
I saw something like that once, one of the first times the played died because I used the wrong firmware. That time I though the problem perhaps was the battery needing to be recharged, so when I plugged the charger to the wall, I saw the screen glowing black. But this hadn't happen again since I'm using the firmware I am using right now.