If I had a pool I would totally try this out. Put a glow stick in a balloon for pool lanterns. Pool party on a Summer night! I think this could work pinned up on the fence of a backyard without a pool, too, so really great idea for any outdoor BBQ/party!
With the world making a conscious effort to be more eco friendly, saving electricity is just one of the feathers in the hat. Though many of us do make the effort to switch off all lights and appliances while leaving the house, we after all are just humans