Solar Cell

Certainly. Large ones.

output power = illumination * area * efficiency

You can't change the illumination, you can't change the efficiency much, but you can certainly change the area!

If by cell, you mean multiple cells, Sure! All you need is a BRIGHT room. Now, If you said how much illumination you had, someone might be able to tell you how big it would have to be and how much it might cost.

Answers are always easier when there's an answerable question.

Once you get past the "clock" and "calculator", what devices do you envision that will run on 3V 5ma of interruptible power that takes up space measured in square feet? mike

FYI, solar cells are sensitive into the near-IR, up to about 1 or 1.1 micron wavelengths. So they are not limited to just the visible light output from the bulb.

Mark

Your basic problem is the incoming wattage. Take a "100W" bulb. Out of this, comes 10W or so of light energy. As you need to intercept about 1/60W, you need to catch 1/600th of the whole output. Taking into account cell efficiency, more like 1/80th of the total output. Or about a 30cm solar panel 1m from the bulb (assuming that it radiates into a hemisphere.

Oops, true. So, maybe a 15cm panel 1m from the bulb, being very generous.