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A lamp doesn't really produce energy; it converts it. It even wastes some energy - with some lamps, a large percentage of energy is wasted (converted to heat).

The amount of energy used by a lamp depends on its wattage (which you can usually read directly from the light bulb), and how long you have it turned on. Watts is a unit of power; meaning, energy converted per unit time. You can read the amount of watts from the light bulb (and from many other electrical equipments - if watts is not indicated, you may be able to find amperes and volts - multiply both to get watts). Typical power consumption for modern (fluorescent) light bulbs is 15-40 watts; older (incandescent) light bulbs are more wasteful, using 60, 100, or even more watts - but wasting much of that power, since a large percentage of this power is converted to heat, instead of light.

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