I like the idea very much, BUT luciferase is not enough, the plant should also produce luciferin (the substrate for luciferase) at the same time. As far as I know, no plant ever produced light by itself via luciferase. I have to spray luciferin on them to make them make any light (which is really expensive stuff!!!). And then I need a supersensitive camera (photon counting, cooled to -70C) to actually "see" any light...
Hope they have some brilliant idea to get around these problems....
GOOD LUCK!