Lighting Calculator

Ever wonder how much you could save simply by replacing your incandescent lightbulbs with compact fluorescent? Click here for our fast, easy-to-use Lighting Calculator. Simply enter the wattage of your current lightbulbs, the number of bulbs and the approximate hours on per day; click Calculate, and you’ll see your monthly and annual savings.

Compact Fluorescent Lightbulbs (CFLs)

CFLs are a "no-brainer"...Just do it! They use 3 to 4 times less electricity than standard incandescent lightbulbs and last 6 to 10 times longer. Sure, CFLs cost a little more to purchase, but on average you'll make up that price difference in less than a year thanks to the energy savings. And you'll save much more over time with the energy savings, and their long-life means you'll buy fewer replacements.

Replacement Chart

If you're looking to replace some standard incandescent bulbs with CFLs, follow this wattage guide.

• 60w incandescent = 14w CFL
• 75w incandescent = 20w CFL
• 90w incandescent = 23w CFL
• 100w incandescent = 27w CFL

CFL Myths

Myth #1 - CFLs take a long time to light

CFLs, especially if exposed to cooler temperatures, can take 60 seconds or longer to reach full output. With the newer electronic ballast, the slow start and flicker of some CFLs have been eliminated. However, CFLs may not be right for every application.

Myth #2 - CFLs aren't as bright as incandescent bulbs

CFLs produce more light per watt of energy consumed than incandescent bulbs. That's why they are described as energy efficient. When it comes to replacing an incandescent bulb with a CFL, light output is a key factor to compare. Choose by lumens, not by watts.

Myth #3 - The light from CFLs makes colors look funny

CFL packages show information about a bulb's ability to show the true colors of an object. The "Color Rendering Index" (CRI) is a scale of 0 to 100. The higher the CRI, the more natural the colors will look. A CRI between 70 and 80 is acceptable for most home applications.

Myth #4 - CFLs emit a cold, bluish light

The actual color appearance of the light is called the color temperature and is measured in degrees Kelvin (K).

Warmer lights are better for most home uses.

Myth #5 - They don't make CFLs in the type of bulb that I need

The bulb selection seems to get better daily. More sizes and different shapes are available at grocery stores, home improvement stores, and lighting retailers. CFLs can be found to fit in chandeliers, above bathroom mirrors, in wall sconces, and table lamps. Some CFLs now on the market can be installed in circuits with dimmers or timers. Three-way CFLs are even available. Manufacturers offer a range of products that vary by color rendering index and temperature. Read the packaging label to find the CFL that is right for your use.

Myth #6 - CFLs cost too much

CFLs cost much less to own and operate than incandescent bulbs. They use 3 to 4 times less electricity, and they last 6 to 10 times longer. Result: fewer bulb changes.

Myth #7 - Watts measure the amount of light produced

Watts measure the energy used; lumens measure the amount of light produced. Some activities, like reading and sewing, require more lumens than more general uses. When you buy CFLs, select those that produce the amount of light (lumens) for the task.