Hi REV BILL,
Blue Gel is a colour filter... I think what you are after is a Black Light - the function of these is to hide all black elements and bring forward white elements.
I also think you require a Cyclorama Light. These are specially designed fixtures which sit at the bottom or top of the "background" and evenly light the area.
So I think you are after a Cyclorama (or Cyc) Light with a Black-Light Bubble. Don't forget that you will need the propper control systems to turn these fixtures on (ie Dimmer and DMX Board, to fade the light up, so the audience doesn't notice it).
Most lighting companies should be able to help you with hiring or purchasing this fixture.
Sincere regards,
Ryan
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