A "100 Watt equivalent" LED bulb uses 13 actual Watts. Let's be generous, and say it's 10W of light, 3W heat. Let's be generous again, and completely wrap the

A "100 Watt equivalent" LED bulb uses 13 actual Watts. Let's be generous, and say it's 10W of light, 3W heat. Let's be generous again, and completely wrap the bulb in 50% efficient photovoltaic, feed that into a 50% efficient battery charger. You now have 2.5 Watts. It just doesn't add up.