You always hear the term "watt" used to distinguish which light bulb fits, sort of like battery types, but what does that mean. Well a watt is the power of the bulb. It is the amount of work or energy given in a certain time. So a 50 watt bulb gives off 50 joules of energy per second. We just call joules/second a watt, and that's what a watt is. The higher the watt the more powerful the bulb is.
If you know the watt of your bulb and can estimate how long it is on, you can actually calculate the amount of energy it uses. The power of watts multiplied by the amount of time gives you the amount of energy it uses (w=pt). So if my lamp is on for one week this is what i would do: (50W)(604,800s)= 3.024x10^7 J
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