not to mention cloudy days, have fun installing it tho, looks a bit extravigant to me. Fiberoptics is the translation of information through light, not the capture and production, fiberoptics contains very very little light the size of a fiberoptic wire is the tip of a pen. And there pretty expenisive. Copper yeah i would have to say why fix something that aint broken, Your not going harvest energy from the sun using a copper wire, maybe some heat thats about it. Coppers oxidized properties(green Salts) are insoluble in water so it should have little effect on your plants, i hydro there shouldnt be a problem maybe soil if the roots grow around the copper, i use copper fittings on my tubs and np's