Wednesday, August 27, 2008

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Throwing A Little Light On Compact Bul

Posted: 26 Aug 2008 02:17 PM CDT


Good for the Maryland Public Service Commission for giving 250,000 Maryland residents two free CFLs each to test out this new bulb. Not all compact light bulbs are equal, and most of us know nothing about them - so here’s a little information to help when choosing CFLs.

If you are a green-minded person, then by buying the Energy Star label, you will be buying a bulb that has been tested to meet operating, reliability and energy efficiency criteria.

CFLs are more expensive than an incandescent, but considering that CFLs last about 8 times as long as an incandescent, that actually represents a lot of savings.

Also consider this: if you replace a l00 watt incandescent with a 25 watt CFL, you will save a whopping $30.00 for the life of the CFL. (This can vary slightly according to individual state costs).

However, something not very often taken into account is to choose the right type of CFL for each room, or for each situation, if you have more than one lamp. The shade of white is differentiated by the color temperature marked on the bulb.

This is identified by correlated color temperature (CCT) and measured by Kelvin (K). Warmer colors correspond to lower Kelvin numbers, while higher Kelvin numbers indicate a cooler, bluer light.

Mostly you will find a limited choice, and most CFLs on the market are 2700-3000 K and project soft white or “warm” light. These bulbs enhance any warm colors such as red, yellow and orange that may be found in the home.

For optimal reading, choose a bulb with a slightly higher K rating (up to 3500 K), but as that K rating increases (to 4100, 5000 and 6500K) the effect is increasingly white to bluish light that enhances cooler colors such as blue, green and violet.

These higher K-rated lights are often referred to simply as “daylight”.

If you are happy with the type of lighting you have in your home, but would like to economize and help the environment by using CFLs, use the following conversion chart to replace the old fashioned bulbs.

40watt bulbs will equal 9-11 wattage;

60watt bulbs will equal 13-16 wattage;

75 watt bulbs will equal 18-20 wattage.

For the ‘green’ among us, who have heard that these CFLs contain mercury - this is true. However each bulb contains about 1% of the amount of mercury we may have in one filling in our mouth, so it is considered to be insignificant.
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