The portal gun is most lilely only used as a prop.
The quinine in tonic water will " glow in the dark " and that room is not very dark. It taste bitter and the only color you will get is greenish. Because of how bright the colors are im almost 100% sure they are LED lights. If you look carefully at the pictures you will see 2 rows of lights and how offset they are to one an other.. Otherwise there are some glow in the dark " paints " out there, you might recall seeing them in laser tag games, they come in various color but im sure they are not food safe.
And like the poster before me, there's a cable on the cake board.