@spottyfox so they're basically the same: semiconductor junctions that deal with photons. if you apply enough light to a LED, it'll produce a voltage. if you apply enough voltage to a solar panel, it'll emit light. neither do a good job of doing the wrong thing, but they do
@rey@spottyfox and, incidentally, if the panels on your roof are emitting visible light at night, you need to do an emergency shut off at the inverter and call someone qualified to do repairs