how do fluorescent lights work
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Christmas lighting technology
For the parent article see Christmas lights
Christmas lighting technology has been subject to considerable development and variation.
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How to choose between an incandesant light bulb or compact ...
Instructions
Difficulty: Moderately Easy Step1There are several factors to consider when deciding whether to buy a compact fluorescent (CFL) or Incandesant light bulb (ILB)
a. Light output equivalency (Lumens or brightness)
b. Initial cost
c. Operating cost
d. If you like the brightness and color of the light
e. Limitations
f. Disposal and health issues
Step2
Light Output Equivalency.
Since CFL’s consume less energy to produce the same amount of light (lumens), they have different wattage ratings. There are differences between the various manufacturers too. Here are some examples.
ILB...........CFL...............Lumens
40 watts....9-13 watts.......450
60 watts....13-15 watts.....800
75 watts....18-25 watts.....1100
100 watts...23-30watts.....1600
Step3
Initial Cost.
The initial cost of a CFL ranges from 4 to 9 dollars, whereas the ILB’s initial cost ranges from 75 cents to 2 dollars. The CFL costs about 5 times more than the ILB.
Step4
Operating Cost.
The operating life of a CFL will last about 10,000 hours. An ILB will last up to about 1000 hours. The CFL will last about 10 times longer.
Taking the purchase cost versus the operating life, we see that the lifetime per hour cost for a CFL that costs $7.50 is about $0.00075 per hour, and for the ILB that costs $0.75, is also $0.00075, not much of a difference here.
Lets look at the operating cost. Consider the average national cost of electricity is about 9 cents per kilowatt hour (1000 watts consumed in one hour). A 100 watt ILB uses 0.9 cents per hour ($0.009) the 100 watt CFL uses 0.00225 cents per hour ($0.000225) which is about one quarter of the power of an ILB.
Step5
Brightness and Color of the Light.
The ILB is sort of reddish yellow which is considered a warm light. The cheap CFL is typically a cool light which is sort of bluish. Why is this important? Colors reflect with a different tint under different kinds of light. How the paint in your room looks will differ, your makeup, your clothes, your carpet and everything else may have a look you don’t like because of the tint. CFL’s are available in different tints such as soft or warm white that approximates the warm glow of the ILB.
Step6
Limitations.
CFL’s do have some limitations. Most don’t work well in the cold. Most don’t work with dimmers.They will not work in the oven. Many will not work in and enclosed fixture (they will get too hot).
ILB's will work in the cold and in ovens.
Step7
Disposal and Health Issues.
CFL’s contain a bit of mercury, which is a potentially poisonous substance. This is not dangerous unless the bulb is broken. Then there are specific methods to clean it up and dispose of it (WHICH I WILL COVER IN ANOTHER ARTICLE). Dispose of old and broken CFL’s through your community hazardous waste program.
Step8
Some important things to consider.
a. If you run your light 24 hours a day for a year, it would run for 8760 hours.
b. Normally you might use your light about 1500 hours a year.
c. So you would replace your ILB once every year or more…… the CFL would be replaced about every seven years!
d. That would be nice for that light high above the stairs and not having to get out the ladder.
e. The annual operating cost for the IFB $13.50 would be and the CFL would be $3.38! So, in the first year the CFL paid for itself. Over seven years a potential savings of over $70 per light.
f. Do you like the spiral shape or the traditional bulb shaped CFL?
