Watts and lumens — they both describe lightbulbs, but do you know what they actually mean? Did you know that wattage is no longer a reliable way to tell how bright a bulb is? Do you know what makes ...

Q I keep reading articles and hear people talk about lumens from a light bulb and watts from a light bulb. I’m told that if I buy a compact fluorescent lamp, that swirly light bulb, that I have to get ...

For most of us, all of our lives we have associated watts with the brightness of a light source. After all, when we change a light bulb at home, we choose a 100 watt bulb if we want more light than we ...

When choosing lighting for your home or workspace, you will often come across two important terms: lumens and watts. For years, people judged a light’s brightness by its wattage. However, with the ...

Still confused about the phase-out of incandescent bulbs? Let's shed some light. Jan. 1 marked the beginning of a new era: Inefficient 40- and 60-watt incandescent bulbs — which represent more than ...

Michael Turner, director and Rauner distinguished service professor, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Ill. Ron Cowen, astronomy writer, Science News, ...

WASHINGTON — For more than a century, buying light bulbs has been a fairly straightforward transaction: Consumers have judged pear-shaped incandescent bulbs by how much wattage, or power, they consume ...