When it comes time to make your mixes, you may want to consider a natural anti-fungus/mold agent if you already haven't. I like to use apple cider vinegar. I have no idea how the beetles would react to it, and can't advise you on how much you will need, so you would have to play with it a bit...
I once did a fishroom light setup that was tied to the weather outside.
I did a solar panel array that powered the lights but didn't use a battery. That way the lights fed directly off the amount of sun that was shining at the time, dimming and getting brighter in direct correlation to the...