CFL bulbs can help you cut quite a bit of energy usage in your home, but you can't measure brightness by looking at wattage levels, like you can with incandescent bulbs. This chart will help you ...

The color temperature of a light, measured in kelvins, is its most noticeable characteristic. A candle, at 1900 K, appears orange. Daylight, at 5500 K, is much whiter and bluer. A 5500-K bulb, however ...

A recent post on the U.S. phase-out of 40- and 60-watt low-efficiency incandescent light bulbs, which became official January 1, elicited a lot of response from readers. Many commenters were critical ...