I like this very much !!!
The discrete aurorae are sharply defined features within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Thanks for sharing.
Line the bottoms of the troughs with mirrors. Silver will also work, but mirrors will be better. Fit the mirrors so they lean up against the downstage side of the trough a little bit. Later, you can adjust the angles of these mirrors. Thanks a lot.
The lights need to be mounted up off the floor through some reliable means, but pointed down at the water troughs. The lights must not be visible to the audience. Thanks a lot.