Changing just one incandescent bulb to a compact fluorescent or "CF" bulb will save you 70% of the energy of the old bulb.
You will realize a 70% cost savings as well. Using the one-at-a-time method you can judge the wattage, color and shape to plan your future bulb replacements.
Compact Fluorescents - One Bulb At A Time.
Changing just one incandescent bulb to a compact fluorescent or "CF" bulb will save you 70% of the energy of the old bulb. You will realize a 70% cost savings as well. Using the one-at-a-time method you can judge the wattage, color and shape to plan your future bulb replacements.
Watts the difference? Incandescent bulbs are rated by the power it takes to light them. A 40-watt bulb uses less power than a brighter, 100-watt bulb. Compact fluorescent bulbs are , pre-efficient. They use about one-fourth the power to produce the same amount of light. So if you want the light of a 100-watt incandescent bulb, choose a 25 watt CF bulb.
Don’t forget to look for the Energy Star Rating on the bulb. The energy star rating assures consistency and efficiency as well as environmental and other benefits.
If you want to use CF bulbs with a dimmer, make sure to look for those especially designed to work with dimmers.Expect to spend a little more as well.
CFs – They’ve come a long way! You may be reluctant to make the switch to CF bulbs because you’ve heard about how much they cost, and the fact they lose some of their brightness over time. Don’t be afraid. Today’s bulbs are even more efficient and they can be used in most every situation. Seventy percent is seventy percent.
Below is a chart to help you compare
|40W||11-14W||> 490||$39-$44||$78-$88||507-572 lbs.|
|60W||15-19W||> 900||$62-$68||$124-$136||806-884 lbs.|
|75W||20-25W||> 1,200||$76-$83||$152-$166||988-1,079 lbs.|
|100W||26-29W||> 1,750||$107-$112||$214-$224||1,391-1,456 lbs|
|150W||38-42W||> 2,600||$163-$169||$326-$338||2,119-2,197 lbs.|
And a real life example:
If you live in Minnesota and replaced ten 100-watt bulbs that are on about four hours a day you would save almost $8.00 per month which equals $96.00 per year or about $960.00 over ten years.
P.S. Don’t forget a CF bulb will also outlast a traditional incandescent bulb ~10 times.