Showing posts with label Lumens. Show all posts
Showing posts with label Lumens. Show all posts

May 4, 2011

Some Illuminating Thoughts

On Jan. 1, 2012, 100-watt incandescent bulbs will start disappearing from store shelves.The front of the new bulb labels will list energy cost and lumens, which can vary widely even for bulbs consuming the same amount of energy or wattage. Lumens already appear on bulb packaging, but we often overlook the fine print.

The back will list the bulb's expected life span, energy consumption and its "light appearance," or color, which is measured on a temperature scale known as Kelvin (K). Lower Kelvin numbers mean the light is more yellow; higher Kelvin numbers mean it's whiter or bluer. The traditional incandescent, which gives off a warm, soft and almost yellowish light, has a temperature of about 2,700 to 3,000K — similar to most halogens. LEDs' temperatures range from 3,300 to 5,000K while CFLs can be quite warm (2,700K), neutral or cold (6,500K).

For kitchens and work spaces, where a brighter and whiter light is desired, look for bulbs marked 3,500 to 4,100K. For a cooler, bluish light akin to daylight, good for reading, look for bulbs with 5,000 to 6,500K.

For CFLs, the back label also notes that the bulbs "contain mercury" which, in high enough doses, can cause tremors, mood swings, headaches and insomnia. (CFLs have, on average, 4 milligrams of mercury, while older thermometers have about 500 milligrams.) No mercury is released unless the bulb breaks. Besides being expensive, I have tried them in my ceiling fans and about one in four burns out within a few months. The new label lists a government website for tips on how to clean up broken pieces and dispose of the bulbs. This is very scary stuff.

Here is a link to a Youtube explaining the new CFL bulbs LINK  This Texas congressman is not happy. If these bulbs are really that good, we would have already bought them and they would not have to be forced on us.