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Here are some more information for Lamp Power:

Advantages of Fluorescent Lamps

Fluorescent lamps are very often used types of lamps of today. They are well known and often used types of lamps because they have a lot of advantages over other types of lamps such as incandescent lamps. While incandescent lamps are banned in many countries today, fluorescent lamps are the type of lamp that is used instead of incandescent lamps. Therefore fluorescent lamps can be found all over the world and in lots of different applications.

In general fluorescent lamps have some advantages that make them an often used type of lamp in contrast to other types of lamps such as incandescent lamps. One of these advantages is that fluorescent lamps are more efficient than other types of lamps such as incandescent light bulbs of an equivalent brightness. In general this can be explained as a greater proportion of the power that is used is converted to usable light and a smaller proportion is converted to heat. This allows the fluorescent lamp to run cooler. In contrast to that the incandescent lamp produces a lot of heat while producing visible light. While a typical 100 Watt tungsten filament incandescent lamp usually converts only 2,6% of its power input to visible light, it is between 6,6% and 15,2% of power input that will be converted to visible light by a typical fluorescent lamp. A further advantage of a fluorescent lamp is referring to its durability. Generally a typical fluorescent lamp lasts between 10 to 20 times as long as an equivalent incandescent lamp. While fluorescent lamps usually have higher initial costs, these costs are more than compensated by the lower energy consumption this type of lighting has over its life. It is also the longer life such a type of lighting has that reduces lamp replacement costs.

Further information: http://www.artelight.co.uk/

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How much does it cost to operate a 40 W lamp continuously for 7 days if the power utility rate is?

15 cents/kW times h?

Well 40W for one day is 24*40 = 960 W.hr = 0.96 kW.hr
Used for seven days, that means 7*0.96 = 6.72 kW.hr per week
At $0.15/kW.hr, that comes to 0.15*6.72 = $1.008

So not very much.

PureSpectrum Issues Correction and Clarification for March 15 Press Release Regarding Fluorescent Lamp and Ballast ...
SAVANNAH, Ga.----In a March 15 press release PureSpectrum announced that it is submitting a dimmable compact fluorescent lamp and dimmable ballast for independent testing and evaluation by the Electric Power Research Institute , and in the release incorrectly implied that EPRI’s testing results could be construed as an endorsement of the products or their capabilities.

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