Friday, April 20, 2012

CFL vs. LED vs. Incandescent Light Bulbs

Compact fluorescent lamps (CFLs) use about 75 percent less energy than standard incandescent bulbs and last up to 10 times longer.

Light emitting diode bulbs (LEDs) seem to be even more attractive, as they use the same amount of energy as CFLs, but last at least 15 times longer than incandescent bulbs. They may eventually replace CFLs as their price goes down.

Replacing incandescent light bulbs with CFLs or LEDs
A CFL or LED bulb will produce the same brightness, or light output, as an incandescent bulb, while requiring less power. Use the Energy Savings Calculator provided below to determine the power and energy savings obtained for each light. The energy savings depend on how long the light is turned on during the day.

Energy Savings Calculator
Old Bulb Power:
New Bulb Power:
Daily Bulb Usage:
Electricity Rate:
Power Savings:
Yearly Energy Savings:
(Numbers are shown as an example. Enter your own data.)

You replace a 60-watt incandescent light bulb with a 13-watt CFL. You are saving 47 watts of power.
Your lamp is turned on 4 hours per day. Your energy savings are 68.4 kWh per year.
At a rate of $0.12233 per kWh (check your electricity bill to find out your own rate), changing a light bulb is saving you $8.37 per year.

Multiply that by the number of lamps you use in the house, and by the number of houses in your city, etc., and these small savings will quickly add up.

Other tips for saving energy
Remember to turn off the light when leaving the kitchen, and make good use of daylight.

Buying guide
CFL and LED packages indicate the wattage of incandescent bulbs with an equivalent light output. For example a 13-watt CFL package will indicate that it is as bright as a 60-watt incandescent bulb. CFLs and LEDs come in various sizes, shapes and color temperatures.



Peter T said...

There are several reasons those supposed savings don't hold up....

One is the heat from incandescents, lowering heat requirement from other sources (when dark it's usually cold),
- referenced below, like the other points here -

Another reason is the CFL power factor, which effectively means twice the energy is used at the power plant to what your meter says - which you will eventually have to pay for

Conversely - any saving means utilities will raise prices or get taxpayer subsidies to compensate for supposed reduced sales
- as seen in California, Ohio etc

And a lot more: The Deception of Savings when Switching Light bulbs, referenced:
Freedom Light Bulb

Street Lighting said...


You have created a good blog. LED light lamps will play a very important role in the nearest future of lighting and will fully replace the incandescent lights.It offers energy-saving products consume fewer amounts of electrical energy and work much longer than other light sources. LED light bulbs are more environmentally friendly and bring no damage to health of people. Thank you.