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Take a green LED and connect it to a DMM, then shine a light at the LED. Under bright light, it will generate a couple of volts, similar to a photovoltaic cell. Green LED's seem to work best. I expect the actual current will be in the microamp range, since the die is often the size of a grain of sand.So an led generates a current from light too.
Yes its used all the time in solar trackers and interactive displays.So an led generates a current from light too.
Here is one of many using LEDs on the webI've done a solar tracker, but it used cds photocells.