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Depends on the bulb. There are different sizes.

<<>>

It is not the wattage of the tubes that is the concern, it is the wattage of the ballast that is connected to the power source that has to be known for circuit loading. Look on the ballast and you will see an amperage that the ballast draws. Use the formula W = A x V to find the line side wattage. Once all of the wattage's have been added up use the formula; I = W/V, this will give you the amperage the circuit so that the wire size and breaker size can be calculated.

<<>> The power used by the bulb, in watts, should be printed somewhere on the bulb. A CFL like the one in the picture would use 15-20 watts.

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8y ago
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12y ago

Incandescent light bulbs are available in all kinds of sizes and shapes and use different amounts of energy depending on their intended uses and sizes.

For household light bulbs, typical energy values range from about 7 to 100 watts.

Low energy types are available using from about 7 to 20 watts and these give out the same range of lighting intensity as conventional incandescent bulbs that use from 60 to 100 watts, so cpmpact fluoresdent light bulbs use about 1/5 (one fifth) of the power to produce the same light.

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11y ago

Look at the ballast and there you will find an amperage that the ballast uses. Also find the voltage that the ballast uses. Use this formula to fine the wattage of the fixture. Watts = Amps x Volts.

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11y ago

There are many variables to take into account to answer this question. The amperage and the voltage to the ballast need to be stated. To find wattage use the following formula, W = I x E. Watts = Amps x Volts. The information that you need can be found on the label of the ballast which is located inside the fixture.

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8y ago

It varies depending on the tube type. A typical long tube (over a meter long) uses 40 watts; that means:* 40 joules/second, or equivalently:

* 0.040 kWh/hour

Similarly, you can look up the rating of any other tube (in watts); the amount in watts is equal to joules/second, or - if you divide it by 1000 - to kWh/hour. The latter is interesting because you typically pay electrical energy by the kWh.

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9y ago

A standard 100 watt incandescent bulb offers the same lumens as a 72 watt incandescent halogen and finally, a compact florescent light (CFL) will use only 23 watts..

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10y ago

If you look on the bulb it's usually marked with the voltage and the power in watts. The power tells you how fast the bulb uses up electrical energy.

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8y ago

The energy in watt-hours every hour is equal to the power in watts. This should be printed on the tube somewhere.

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8y ago

The rating of fluorescent lights, or any other type, is always written on the light. Generally fluorescent lights are more energy efficient than incandescent lights.

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10y ago

1/5 of the amout of incandescent lights.

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Q: How much energy do fluorescent light tubes use per hour?
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What is the approximate percentage of electrical energy converted to light energy in an incandescent bulb?

A typical light bulb wastes 90 percent of electricity. According to the EPD, the typical incandescent light bulb turns only about 10 percent of its electricity into light. A typical light bulb, when on, is hot. That's because 90 percent of the energy is wasted as heat, which means it isn't very energy-efficient. A typical light bulb wastes 90 percent of electricity. According to the EPD, the typical incandescent light bulb turns only about 10 percent of its electricity into light. A typical light bulb, when on, is hot. That's because 90 percent of the energy is wasted as heat, which means it isn't very energy-efficient.


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