Some Cicada insects can produce up to 108 db of noise levels. So lets take advantage of it. We could have a cage of cicada's inside a sphere of speakers converted into "sound to electrical energy converters". In an eight foot sphere full of these converters could produce electrical energy to charge a battery bank. The lighting intervals could be adjusted to increase the time the cicada's are the most active making noise. Of course we would need to give the canada's food and water.
I at first thought of using the world's largest tuning fork and having a solenoid hit it each time the db's dropped down by 6 db. But even then the power produced would likely not be enough to strike the tuning for once in awhile.
This whole concept may not bug you, but it sure bugs me. Ha, Ha, Ha.
The Lunkester
It might be more efficient to use the noise from cars, motorcycles and lorries near busy roads and intersections. The vehicles will be fed by their owners
Greetings, Conrad