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 ...

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 ...

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 ...

LED maker Cree announced this week that it had achieved a new record in terms of lighting efficiency, harvesting 303 lumens per watt from a white high power LED at room temperature. This represents a ...

Take a look at a couple of comments on the previous post regarding the efficacy of production LEDs. A reader points out that using 683lm/W (from Wikipedia) as the 100% luminous efficacy figure, ...

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

Katherine Martinko is an expert in sustainable living. She holds a degree in English Literature and History from the University of Toronto. The U.S. Department of Energy is cranking up the minimum ...

Why is Christian Science in our name? Our name is about honesty. The Monitor is owned by The First Church of Christ, Scientist, and we’ve always been transparent about that. The church publishes the ...

Previously white LEDs had a max of about 60 lumens per watt but the new White LEDs have 135 lumens per watt and match the best lighting alternatives The new LED can replace traditional fluorescent ...