How many watts is there in a light bulb?

600-1100 watts

I've some 3volt bulbs that are rated at 80 mA, which means it uses draws 2.4 Watts.

There are also small 7 watt 120v bulbs, usually used in night lights.

The maximum load you can put on a 15A 120v circuit, without blowing a circuit breaker or fuse would be 1800 watts.