Well this is a good idea

I studied this at Duke over the summer. It’s a very appealing idea, but unfortunately it would not be successful because the lights are not very bright and they require a disturbance to activate, such as when you put your hand in the water and stir it, disturbing the zooplankton and causing them to produce GFP to glow. As there is no efficient way to “disturb” a tree, it would not function.

But they're GMOs so they're evil and will kill you!~