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There isn't any energy in a lightbulb. A lightbulb is only an energy conversion tool. What happens to that energy has a couple of ansers depending on what frame of reference you are using.

A lightbulb converts electrical energy into light and heat; so that is the immediate answer. However, eventually even the energy that leaves the bulb as light becomes heat after the light (radiant) energy strikes an opaque body (non-transparent). So it is also true that eventually all of the electrical energy that is converted by a light bulb eventually becomes heat.

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