Standard bulbs are designed to work with a voltage of around 120 V, which is an unusual range for batteries. Ordinary flashlight bulbs are designed to work with about 3V, easy to obtain with two batteries in series. Bulbs from cars are usually designed to work with about 12V, the output of a car battery or of eight standard battery cells in series. You yourself generate about 60 W of heating power, the same as a 60 W bulb, but I'll bet you don't visibly glow very much. That's because your temperature is too low to give off visible light. The light you do give off is infrared, which can be detected but not directly by our eyes.
